JNCIS-ENT (August 2022)

Which two statements about BPDU protection are correct? (Choose two). BPDU protection prevents unauthorized switches from connecting to and participating in your spanning tree topology. BPDU protection requires that STP and RSTP is configured on the switch. By default, BPDU protection prevents the root bridge from communicating with other STP members unless it receives a superior BPDU first. By default, you must manually clear a BPDU error condition when using BPDU protection.

Which type of route is shown in the exhibit?. Generated. Direct. Static. Aggregate.

What are three requirements to ensure GRE or IP-IP tunnel routing?(Choose three). Tunnel endpoints must have a route that directs traffic into the tunnel. BGP must be used on intermediate devices. Tunnel endpoints must have a valid route to the remote endpoint. All Intermediary devices must have a route to the tunnel endpoints. Keepalives must be used on stateless tunneling protocols.

Which two statements about the default load balancing behavior for the Junos OS are correct? (Choose two). By default, the Junos OS performs a per-packet load balancing operation. By default, the Junos OS installs multiple equal-cost next hops in the forwarding table for a destination prefix. By default, the Junos OS selects one of the equal cost next hops for received destination prefixes. By default, all Packet Forwarding Engine slots are assigned the same hash value on the Junos device.

You must limit the access to a printer with a persistent DHCP address of 2001:db8 000050:* */64 in MLAN v50 to users assigned to VLAN v50 only. Which action would satisfy this requirement?. Implement a firewall filter on the RB interface for VLAN V50, blocking traffic to/from 2001.db8:0000:50:**. Implement persistent MAC learning to ensure that 2001.db8:0000:50:** is allocated properly. Implement a firewall filter on the VLAN 50, blocking traffic to/from 2001.db8:0000:50:*. Implement DHCP snooping on VLAN v50 to ensure that 2001.db8:0000:50:** is allocated properly.

You are attempting to set up IS-IS on a device that has two interfaces (ge-0/0/1.0 and ge-0/0/2.0) in Level 1 and one interface (ge-0/0/0.0) in Level 2; however, it does not participate in either level. Referring to the exhibit, what is the problem?. All of the interfaces must have the level disable statement removed. One of the interfaces requires a network entity title on it. The interface must participate in both levels. The ge-0/0/0.0 interface must have the Level 1 disable statement removed.

You have two routers unable to form an IS-IS Level 1 adjacency. Which two statements describe a reason for this problem? (Choose two). Interface lo0 is not included as an IS-IS interface. The area numbers are different. The MTU is set to 1500. The interfaces are on different subnets.

Referring to the exhibit, which type of route is displayed?. Aggregate. Generate. Martian. Static.

What are three reasons a router would send out an IS-IS link-state PDUP? (Choose three). The cost of a link to an existing neighbor has changed. A new neighbor exists on the link. The routers link to a neighbor goes down. A new external route is imported from BGP. IS-IS sends link-state PDUs at random intervals.

Which three statements describe what happens when processing a frame for a switched packet? (Choose three). The ingress PFE performs the MAC address lookup. The egress PFE forwards the packet out the egress port towards the destination. The frame enters the ingress port and is forwarded out all ports. The frame enters the ingress port and is processed by the ingress PFE. The ingress PFE sends the header information to the Routing Engine.

You are deploying a new switch configuration at a small branch using EX3400 Series switches. You are concerned about loop prevention. In this scenario, which configuration would you deploy?. EVPN. BPDU. RSTP. MPLS.

What is a purpose for the OSPF database description packet? (Choose two). To determine who is in charge of the database flushing. To transfer the LSUs between two systems. To determine who is in charge of adjacency formation. To transfer the LSA headers between two systems.

Which statement describes BFD?. BFD provides broadcast storm protection. BFD provides route loop protection. BFD rapidly detects link failures. BFD provides high availability with multiple Routing Engines.

You are configuring IBGP and you must ensure that reachability between participating routers, even if the physical topology changes. Which two actions should you perform? (Choose two). Configure IBGP peerings to loopback addresses. Configure static routes to all IBGP peers. Configure an IGP within IBGP network. Configure DHCP on all IBGP devices.

What is the default route preference for BGP?. 150. 167. 170. 179.

The router D is not configured. How does OSPFv3 determine the router ID in this situation?. OSPFv3 uses the IPv4 address of the first interface that comes up. OSPFv3 uses the IPv6 address of the first interface that comes up. OSPFv3 uses the IPv6 address of the last interface that comes up. OSPFv3 uses the IPv4 address of the last interface that comes up.

You are concerned that someone from outside the company could use an open conference room port to access the network. Which feature should you use to address this concern?. DHCP snooping. Persistent MAC learning. MAC limiting. 802.1X.

Which two statements about Layer-2 loop prevention protocols are correct? (Choose two). STP uses point-to-point and edge port designations. RSTP uses point-to-point and edge port designations. With STP, a designated port can transition to the forwarding state without waiting for the protocol timers to expire. With RSTP, a designated port can transition to the forwarding state without waiting for the protocol timers to expire.

Which statement is correct about access ports?. By default, access ports accept only VLAN tagged traffic. Access ports must have an IRB assigned to accept untagged traffic. Access ports must have an IRB assigned to accept VLAN tagged traffic. By default, an access port can only have a single VLAN assigned.

Which two statements about the root bridge election process are correct? (Choose two). The lowest root bridge identifier is preferred over higher root bridge identifiers. The lowest root bridge priority is preferred over higher root bridge identifiers. The highest root bridge priority is preferred over higher root bridge identifiers. The highest root bridge identifier is preferred over higher root bridge identifiers.

Which two statements are true regarding RIB groups? (Choose two). A RIB group must contain one or more import-rib statements. A RIB group must contain one or more export-rib statements. The first table listed is the primary route table and determines the address family of the RIB group. The last table listed is the primary route table and determines the address family of the RIB group.

Which two port security mechanisms rely on an accurate DHCP snooping database to operate correctly? (Choose two). Dynamic ARP inspection. MACsec. Persistent MAC learning. IP source guard.

In which adjacency state do OSPF routers determine which router is in charge of the database synchronization process?. Init. 2-Way. Exchange. ExStart.

Which three link-specific fields must match between OSPF neighbors before they form an adjacency over a broadcast medium? (Choose three). Dead interval. Router priority. Neighbor options. Hello interval.

Which OSPF area type receives only the default route from the backbone?. Stub area. Transit area. Not so stubby area. Totally stubby area.

If an EX series switch receives a frame with a known destination MAC address, what is the expected behavior?. The frame is sent out all ports assigned to all configured VLANs exept. The frame is sent out the egress port with a matching destination MAC address within the bridge table associated with the ingress VLAN. The frame is sent out all trunk ports associated with the ingress VLAN regardless of whether a matching MAC address was found in the bridge table. The frame is sent out all ports assigned to the associated VLAN except the ingress port which the frame was received.

You are configuring OSPF and want to ensure that interface ge-0/0/3 is preferred over interface ge-0/0/4. Which statement is correct in this scenario?. Configure ge-0/0/4 with a higher metric. Configure a redistribution policy. Configure reference bandwidth. Configure ge-0/0/3 with a higher metric.

Which statement about persistent MAC learning is correct?. Trunk ports require MAC address to be configure on each VLAN. Access ports must be configured with no-mac-learning command. Port moves required manual operator intervention. 802.1X must be configured on the port for the persistent MAC learning to work.

Which statement describes GRES?. GRES rapidly detects link failures. GRES requires NSR to function properly. GRES provides hardware-level high availability. GRES provides routing loop protection.

You do not any spanning tree protocols operating in your environment, and you want to ensure that no BPDUs cart be introduced into the environment. Which statement is true in this scenario?. Incoming BPDUs are blocked by default if a spanning tree protocol is not operating. You can block BPDUs without running a spanning tree protocol using Layer 2 control. Incoming BPDUs can only be blocked by the root bridge. You must run a spanning tree protocol to block BPDUs.

A BGP session shows the state as active. What does this state indicate in this scenario?. The routers are still trying to establish a TCP connection. A keepalive message has been received. The BGP session is fully established and routes are being passed. The TCP connection is successful, and BGP is waiting for the OPEN message from its peer.

Which two statements concerning IS-IS adjacencies are correct? (Choose two). For level 2 adjacencies, the area IDs can be different. Level 2 routers can form an adjacency with Level 1 routers. For level 1 adjacencies, the area IDs can be different. Level 2 routers do not form adjacencies with Level 1 route.

What is a characteristic of OSPF ASBRs?. ASBRs link two OSFP areas. ASBRs transmit routing information between the backbone and other areas. ASBRs cannot be part of the backbone and another area at the same time. ASBRs inject routing information from outside the OSPF domain.

A routing table contains multiple BGP routes to the same destination prefix. The route preference is the same for each route. Referring to the exhibit, which route would be selected?. Route C. Route D. Route A. Route B.

Referring to the exhibit, what does the asterisk (*) following the ge-0/0/5.0 interface indicate?. It indicates the interface is active. It indicates the interface is not active. It indicates the interface is a trunk port. It indicates the interface is an access port.

Referring to the exhibit, which statement is correct?. The local bridge priority is set to 8K. This device is the root brigde. The bridge priority on the root device is set to 8K. The spanning tree session has timed out.

Which two statements about a unified ISSU are correct? (Choose two). It requires that bidirectional forwarding detection be disabled. It requires that graceful routing engine switchover be enabled. It is only supported on platforms with redundant power supplies. It is only supported on platforms with redundant control planes.

Referring to the exhibit, which devices will receive the packet sent by User B?. User C, User A and User D. User C and User D. User A and User D. User C.

Referring to the exhibit, which port on Switch-2 will be selected as the RSTP root port?. ge-0/0/8.0. ge-0/0/10.0. ge-0/0/1.0. ge-0/0/9.0.

Router1 is receiving BGP router from Router2. There BGP routes should be passed from Router1 to router3. However, the 172.16.20.4/30 route is not being passed on to Router3. Why is this problem ocurring?. The 172.16.20.4/30 route is not active on Router1. The keep-all statement is not configured on Router3. The import policy on Router3 is configured incorrectly. The 172.16.20.4/30 route has an unusable next hop on Router1.

The R1 learns about Route X. Which statement is correct about Route X when using the default BGP advertisement rules?. R2 will not advertise this route to R3 without an explicit policy. R1 will not advertise this route to any peers. R4 and R5 will not advertise this route to each other. R3 will not advertise this route to R4 or R5 without an explicit policy.

You are implementing the network shown in the exhibit. You must ensure that all users can communicate with each other. What are three steps that should be taken in this scenario? Choose three. You must configure a single logical IRB interface with an ip address for each of the three networks. You must define all ports as trunks ports and include all VLANS as members. You must define all ports as access ports and include the appropriate VLAN as a member. You must specify the appropriate layer 3 IRB interface under each VLAN. You must create an unique logical IRB interface for each network and assign an ip address within the appropriate network.

Which two statements are correct? Choose two. R2 and R3 can form a level1 is-is adjacency. R1 and R5 can form a level1 is-is adjacency. R3 and R4 can form a level2 is-is adjacency. R4 and R5 can form a level1 is-is adjacency.

You are building a network and make some configuration changes. While trying to validate these changes, you receive the error shown in the exhibit. How would you solve this problem?. You must configure the ge-0/0/5 interface with family inet instead of family ethernet-switching. You must create a new VLAN called all using the vlan id of 30. You must create two sub-interfaces on ge-0/0/5 with the appropriate VLAN member assigned to each. You must configure the port mode as trunk on the ge-0/0/5.0 interface.

Which port will be selected as the RSTP root port on Switch-4?. ge-0/0/9.0. ge-0/0/13.0. ge-0/0/12.0. ge-0/0/8.0.

Your company has connections to two ISPs. Each ISP is in a separate routing instance. You need to advertise the 0.0.0./0 prefix from both ISPs to all your devices. Referring to the exhibit, which statement is true in this scenario?. You must create a RIB group to share interface routes. You must create a policy to allow traffic from your network to each ISP. You must create and apply match input filters on interfaces ge-0/0/2 and ge-0/0/3. You must create an internal routing instance for your network.

You have an ESXi host that is connected to ge-0/0/23 on a juniper EX series switch. You added a new VM that will also use the same ge-0/0/23 interface. Unfortunately, the new VM is not able to reach external devices. Referring to the exhibit, which command would solve this problem?. set vlans default switch-options interface-mac-limit 4. set switch-options interface ge-0/0/23.0 interface-mac-limit 3. clear ethernet-switching recovery-timeout interface ge-0/0/23.0. set vlans default switch-options interface-mac-limit 5.

By default, how long will a learned MAC address be retained in the bridge table on an EX series switch?. 300 seconds. 600 seconds. 1800 seconds. 3600 seconds.

The next hop for the route is not reachable. In this scenario, what are two ways that BGP handles this route? (Choose two). The route is not placed into the forwarding table. The route is placed into the forwarding table as an inactive route. The route is placed into the forwarding table as a hidden route. The route is placed into the routing table as a hidden route.

You are asked to configure filter-based-forwarding (FBF) to forward traffic sourced from a specific subnet to a webserver. In this scenario, which mechanism is used to add interface routes to the forwarding routing instance used in EBGP?. Routing policy. RIB groups. Forwarding policy. Generated routes.

Which statement is correct about the OSPF router ID?. The ospf RID for IPv6 is a 128-bit address. The OSPF must match for all routers in the same area. The OSPF rid is not necessary when BFD is implemented. The OSPF rid for ipv4 is a 32-bit address.

Which protocol supports tunneling of non-ip traffic?. GRE. IPsec. IP-IP. SSH.

What are three reasons a bgp route would be hidden? (Choose three). It is rejected by a firewall term. It is suppressed by a damping policy. The local preference is 0. The next hop is unreachable. The as path contains a 0.

What are three valid BGP messages types? (Choose three). Database descriptor. Keepalive. Update. Refresh. Hello.

You are responsible for mapping a Layer-2 network using RSTP for loop prevention. You recently committed the configurations shown in the exhibit. unfortunately, the Switch-2 became the root bridge and you must ensure that switch1 becomes the root bridge when available, for this RSTP topology. Referring to the exhibit, which configuration change should be performed? (Choose two). Configure the bridge priority on switch1 as 4k. Configure the system MAC on switch1 to be higher than the other two switches. Configure ge-0/0/1 and ge-0/0/8 interfaces on switch1 to have a priority of 255. Configure the ge-0/0/1 and ge-0/0/8 interfaces on switch1 to have a cost of 0.

Given the exhibit, which two statements are correct regarding the graceful-restart state for BGP groups?(Choose two). The Graceful-restart capability will be enable for group EBGP. The Graceful-restart capability will be disable for group IBGP. The Graceful-restart capability will be enable for group IBGP. The Graceful-restart capability will be disable for group EBGP.

You have an IBGP neighbor sending you routes. You need to apply a policy so it only evaluates routes being learned from this specific neighbor. In this scenario, which statement is correct about applying the policy?. The policy should be applied as an import policy to the bgp group level. The policy should be applied as an import policy to the bgp neighbor level. The policy should be applied as an export policy to the bgp group level. The policy should be applied as an export policy to the bgp neighbor level.

You have an OSPF NSSA area that is also receiving is-is routes on the ASBR. In this scenario, which LSA type is used to announce, external IS-IS routes?. Type 7. Type 1. Type 4. Type 8.

Your bgp router receives routes from two upstreams ISPs: ISP A and ISP B. In this scenario, which change would you make to prefer routes from ISP A?. Set the local preference attribute for all routes received from ISP A to 50 while all routes received from isp. Change the MED value for all routes received from ISR A to 1 while all routes from ISP B remain configured with no MED value. Prepend the AS path to all routes received from ISP A while all routes received frmo ISP B use the default local preference value of 100. Set the local preference attribute for all routes received from ISPA to 200 while all routes received from isp.

Which two statements are true about a unified in service software upgrade (ISSU)? (Choose two). The graceful routing engine switchover (GRES) and nonstop active routing (NSR) features. Unified issu is only supported by the dual routing engine platforms. The master routing engine and backup routing engine can be running different junos versions before performing a unified ISSU. It is possible to take PICs offline or brine them online during a unified ISSU.

Which statement is true about the configuration shown in the exhibit?. Only the next-hop-self export policy will be evaluated when routes are sent to neighbor 172.30.1.1. Both the adv-aggregate and ad-custom export policies will be evaluated when routes are sent to neighbor 172.30.2.1. Both the adv-aggregate and ad-custom export policies will be evaluated when routes are sent to neighbor 172.30.1.1. Only the adv-custom export policy will be evaluated when routes are sent to neighbor 172.30.2.1.

Which two statements about layer 2 firewall filters are correct? (Choose two). You can apply multiple input filters per VLAN. You can apply only one input filter per VLAN. You can apply only one firewall filter term per filter. You can apply multiple firewall filter terms per filter.

Which two statements about a virtual chassis are correct? (Choose two). A virtual chassis is managed using a single virtual console port. Each device must be managed separately. All members in a virtual chassis must be running the same junos version. You must use the same EX series switch for all members in a virtual chassis.

Which two statements about layer 2 loop prevention protocols are correct? (Choose two). STP distributes the current tree topology using the root bridge. RSTP can take 30 to 50 seconds to respond to a topology change. STP can take 30 to 50 seconds to respond to a topology change. RSTP distributes the current tree topology using the root bridge.

Which two statements about OSPF not so stubby areas are correct? (Choose two). The ASBR originates type 5 LSAs for redistributed external routes. Type 7 LSAs are translated by the ABR into type 5 LSAs. The ASBR originates type 7 LSAs for redistributed external routes. Type 5 LSAs are translated by the ABR into type 7 LSAs.

Which two statements about DIS elections in ISIS are correct? (Choose two). The router with the lower priority value becomes the dis. If a priority tie occurs, the router with the higher subnetwork point of attachment. If a priority tie occurs, the router with the lower subnetwork point of attachment. The router with the higher priority value becomes the dis.

Each pc and ip phone in your network is connected to a switch using the same port. All incoming data traffic is untagged and belongs to the v10 VLAN, while traffic coming from the IP phones is tagged with a VAN value of 20 and should belong to the v20 VLAN on your switch. In this scenario which statement is correct?. You must enable the Voice VLAN feature on the incoming interfaces and assign the v20 VLAN. You must enable LLDP-MED pa the incoming interfaces and assign the v20 LAN. You must enable the guest VLAN feature on the incoming interfaces and assign the v20 VLAV. You must enable the IRB interface and assign it to the v10 and v20 VLANS.

your router is learning the 172.25.11.0/24 prefix from both the BGP and OSPF protocols, A routing policy is configured on your device to advertise the prefix to an established BGP peer but the peer is not receiving the prefix. You want to allow the prefix to be advertised to the BGP peer. What should you do on this router to satisfy this request?. Enable the automatic removal of private AS numbers from the prefix. Enable the automatic advertisement of inactive BGP routes. Enable the automatic removal of peer AS information from the prefix. Enable the automatic refreshing BGP routes.

You have a VLAn with two devices acting as a single gateway for hosts. In this scenario, which protocol would provide a single gateway IP for the hosts?. BGP. OSPF. VRRP. IS-IS.

Referring to the exhibit, which set of interfaces is enabled for ethernet switching?. ge-0/0/6, ge-0/0/7, and ge-0/0/8. ge-0/0/6, ge-0/0/8, and ge-0/0/10. ge-0/0/6 and ge-0/0/8. ge-0/0/6, ge-0/0/7, ge-0/0/8 and ge-0/0/10.

Which two statement is about Martian addresses are correct? (Choose two). Martian Addresses are installed in the routing table by default. Martian Addresses can only be applied to the inet routing table. Martian Addresses require a route prefix match type. Martian Addresses are not installed in the routing table by default.

On EX Series devices, what are two software features that accommodate redundancy? (Choose two). NSR. OAM. ICMP. GRES.

Which two statement about aggregate routes in Junos OS are correct? (Choose two). An active route can contribute only to a single aggegate route. An aggregate route always shows as active in the routing table. Only one aggregate route can be configured for each destination prefix. An aggregate route has a default next hop of each IP address.

Which two statements about RSTP are correct?. RSTP permits multiple root bridges within a Layer 2 domain. RSTP permits only a single root bridge within a Layer 2 domain. RSTP is not backward compatible with STP. RSTP is backward compatible with STP.

What are two Layer-2 firewall filter types? (Choose two). VLAN based. Packet-based. Port-based. Flow-based.

What are two functions of bridging? (Choose two). Forwarding. Blocking. Aging. Listening.

You notice that currently two MAC addresses are associated with a single access port in the bridge table of one of your EX series switches. What are two explanations for this behavior? (Choose two). The mac-move-limit feature has been disabled on the access port. The access port connects to an IP phone which connects to a host device. The native VLAN feature has been associated with the access port. The access port connects to a multiple hosts through a rogue device.

Which two statements are true about GRE tunnels on junos devices? (Choose two). Only one GRE tunnel can be included for each logical unit. GRE interfaces can include multiple logical units. Multiple GRE tunnels can be included for each logical unit. GRE interfaces can include only a single logical unit.

Router1 and Router2 must connect through the internet using tunneling technology hosts that are connected to Router 1 and Router 2 will be sending traffic up to 1500 bytes. The maximum segment size that is supported accross the path is 1520 bytes. Which tunneling technology will allow this communication to take place?. IPsec VPN tunnel mode. IP-IP tunnel. GRE tunnel. IPsec VPN transport mode.

You are running a virtual chassis with nonstop routing enabled. You want to confirm that the BGP routing table synchronization has completed on the backup routing engine. Which command will show you this information?. show BGP neighbor. show BGP summary. show BGP replication. show task replication.

Referring to the exhibit, which router will be selected as the DR?. R1. R5. R3. R4.

Switch-1 in the exhibit receives a packet from user A with a destination MAC address of 00:26:88:02:74:48. which statement is correct?. Switch-1 floods the packet out ge-0/0/7 and ge-0/0/8. Switch-1 sends the packet out ge-0/0/8 only. Switch-1 floods the packet out ge-0/0/6, ge-0/0/7, and ge-0/0/8. Switch-1 sends the packet out ge-0/0/7 only.

Referring to the exhibit, which statement is correct?. R1 and R2 are elected as DROthers. R3 and R4 have an adjacency state full. R3 has the complete OSPF database. R4 is elected as the DR.

You have configured storm control you network devices. Your network has grown and you no longer have time to investigate each occurence of a storm control violation. You want to enable a port to automatically be re enabled after storm violation. In this scenario, which Junos OS configuration timeout would accomplish this task?. Configure the port error disable timeout. Configure the secure access port timeout. Configure the MAC aging table timeout. Configure the BPDU blocking timeout.

Referring to the exhibit, the IBR interfaces are configured with which family?. irb. L3-inteface. ethernet switching. inet.

Referring to the exhibit, which interface is assigned the active VPN?. Router A ge-0/0/2. Router B ge-0/0/1. Router B ge-0/0/2. Router A ge-0/0/1.

Referring to the output shown in the exhibit, which two statements are correct? (Choose two). The device is an ABR. The device is not an ABR. The device originated the 192.168.1.1 database only. The device originated the 192.168.1.2 database entry.

Referring to the exhibit, which two statements are true? (Choose two). R1, R2 and R3 should use EBGP for the BGP peering sessions. R1, R2 and R3 should use IBGP for the BGP peering sessions. R1 and R4 should use EBGP for the BGP peering sessions. R1 and R4 should use IBGP for the BGP peering sessions.

You are trying to form an IS-IS adjacency between router A and Router B, but the IS-IS adjacency will not form between the two routers. referring to the exhibit. Which action would solve this problem?. Enable Level 1 IS-IS routing on Router A. Enable Level 2 IS-IS routing on Router B. Enable IS-IS wide metrics on Router B. Enable IS-IS wide metrics on Router A.

Why is the route shown in the exhibit hidden?. The route cannot reach the protocol next hop. The router is being rejected through an import policy. The route is being rejected through an export policy. An MPLS LSP is unavailable.

Which statement about the configuration shown in the exhibit are correct? (Choose two). Multiple equal-cost next hops are installed in the forwarding table for the 192.168.2.0/30 prefix. Two next-hop interfaces should appear in the routing table for the 172.20.112.0/24 prefix. Only the selected next-hop interface should appear in the forwardfing table for the 172.20.112.0/24 prefix. The route preference is the same for each static route.

Referring to the exhibit, which two statements about the BGP connection are correct? (Choose two). The local device has AS 100 configured but the peer is expecting AS 101. This is an IBGP peering session. This is an EBGP session. The local device has AS 101 configured but the peer is expecting AS 100.

you are troubleshooting OSPF issues on your device. You run a trace log and receive the error shown in the exhibit. What would cause this error?. MDS authentication error. Stub area mismatch. Subnet mismatch. Missing route policy.

Referring to the exhibit, which statement is correct?. The router is acting as DR. The router is acting as a DROther. The router is acting as the BDR. The router is not able to establish adjacency.

Referring to the exhibit, which three statements are correct? (Choose three). R1 and R3 can form a Layer 2 IS-IS adjacency. R3 and R4 can form a Layer 2 IS-IS adjacency. R3 and R4 can form a Layer 1 IS-IS adjacency. R2 and R4 can form a Layer 1 IS-IS adjacency. R1 and R3 can form a Layer 1 IS-IS adjacency.

You have created a GRE tunnel as shown in exhibit. The router with tunnel endpoint A is dropping packets originating from user A and destined to User B. What would cause this problem?. User A requested fragmentation and endpoint A has the clear-dont fragment-bit parameter enabled. User A is sending maximum size default ethernet frames with the DF bit enabled. Endpoint A has the internet-options gre-path-mtu-dicovery parameter enabled. endpoint A is missing a policy statement that allows user A's traffic into the tunnel.

You are configuring IS-IS on the newly provisioned ae88 interface. After you commit the configuration, you notice that your adjacency is not showing up. referring to the exhibit, what is the reason for the adjacency being down?. R1 and R2 are configured for different areas. R1 and R2 are configured for different metrics. R1 and R2 have different interface parameters. R1 and R2 are in different IS-IS levels.