Estudos para certificação 6

Which of the following IPv4 addresses are Class A addresses? (Multiple choice). 100.1.1.1. 172.16.1.1. 192.168.1.1. 127.0.0.1.

Which of the following descriptions about OSPF's Router ID is wrong? (Multiple choice). The prerequisite for the normal operation of the OSPF protocol is that the router has a Router ID. The Router ID must be the same in the same area, and the Router ID in different areas can be different. Router ID must be the IP address of an interface on the router. The Router ID must be specified by manual configuration.

Which statement about the TTL field in the IPv4 header is correct? (Multiple choice). TTL value length is 80bit. Every time a packet passes through a Layer 3 device, the TTL value is reduced by 1. When there is a loop in the route, the TTL value can be used to prevent the data packet from being forwarded infinitely. The range of TTL value is 0-255.

In which state does the OSPF protocol confirm the master-slave relationship of the DD message?. 2-way. Exchange. Full. ExStart.

As shown in the figure, two switches use the default parameters to run STP root primary, switch B uses the configuration command STP priority 0, which of the following ports will be blocked?. G0/0/3 of HUB. G0/0/2 of switch A. G0/0/1 of switch A. G0/0/1 of switch B.

As shown in the figure, after OSPF is configured on the two routers, the administrator configures the <silent-interface s0/0/0> command on the RTA, so which of the following descriptions is correct? (Multiple choice). RTA will continue to receive and analyze OSPF packets sent by RTB. The neighbor relationship between the two routers will be down. The neighbor relationship between the two routers will not be affected. RTA will no longer send OSPF packets.

At which layer of the OSI reference model does the Ethernet switch work?. Data link layer. Transport layer. Physical layer. Network layer.

By default, the root path cost of the root bridge in the STP protocol must be. True. False.

As shown in the figure below, all hosts can communicate normally, so which is the correct relationship between SWA MAC address and port?. MAC-A G0/0/1 MAC-B G0/0/2 MAC-C G0/0/1. MAC-A G0/0/2 MAC-B G0/0/2 MAC-C G0/0/3. MAC-A G0/0/1 MAC-B G0/0/1 MAC-C G0/0/3. MAC-A G0/0/1 MAC-B G0/0/2 MAC-C G0/0/3.

Which of the following statements about link aggregation in LACP mode is correct?. There can only be a maximum of 4 active ports in LACP mode. The number of active ports cannot be set in LACP mode. In LACP mode, all active interfaces participate in data forwarding and share load traffic. In LACP mode, devices at both ends of the link send LACP packets to each other.

The configuration information of a certain port of the switch is shown in the figure, which of the following statements is wrong? # interface GigabitEthernet0/0/2 port hybrid pvid vlan 100 port hybrid tagged vlan 100 port hybrid untagged vlan 200. #. The port type is Hybrid. If the VLAN TAG carried by the data frame is 200, the switch strips the VLAN TAG and sends. If the port receives a data frame without VLAN TAG, the switch needs to add VLAN TAG 100. If the VLAN TAG carried by the data frame is 100, the switch strips the VLAN TAG and sends.

By default, how many seconds is the Forward Delay time of the STP protocol?. 15. 10. 20. 5.

Which of the following protocols is OSPF based on?. IP. HTTP. UDP. TCP.

In order to ensure that the same data flow is forwarded on the same physical link, which method of load sharing does Eth-Trunk use?. Flow-based load balancing. Packet-Based Load Balancing. Load sharing based on application layer information. Load sharing based on the incoming interface of data packets.

The MAC address table of a certain switch is shown in the figure. If the switch receives a data frame with the destination MAC address 5489-9811-0b49 from the Eth0/0/2 port, which of the following statements is correct?. Forward this data frame from Eth0/0/2 port. Discard this data frame. Forward this data frame from Eth0/0/3 port. Flood the data frame ou.

RSTP configures the value of the Type field in the BPDU message?. 0x03. 0x01. 0x00. 0x02.

In which view can the administrator modify the device name for the router?. Protocol-view. User-view. System-view. Interface-view.

It is known that there are two entries in the routing table of a certain router as shown in the figure. If the router wants to forward the message with the destination address of 9.1.4.5, which of the following statements is correct? Destination/Mask Protocol Pre Cost Nexthop Interface 9.0.0.0/8 OSPF 10 50 1.1.1.1 Serial0 9.1.0.0/16 IS-IS 15 100 2.2.2.2 Ethernet0. Choose the second item as the best match, because Ethernet0 is faster than Serial0. Choose the second item as the best match, because the cost of the RIP protocol is small. Select the first item as the best match, because the priority value of the OSPF protocol is higher. Select the second item as the best match, because this route is a more precise match than the destination address 9.1.4.5.

In the network shown in the figure below, if the network where host A is located is required to access the Internet through Easy IP, which of the following ACLs should be used on the G0/0/3 interface of router A?. acl number 2000 rule 5 permit source 10.0.12.0.0.0.0.255 #. acl number 2000 rule 5 permit source 10.0.13.0.0.0.0.255 #. acl number 2000 rule 5 permit source 10.0.12.1.0.0.0.0 #. acl number 2000 rule 5 permit source 10.0.13.1.0.0.0.0 #.

NAPT distinguishes the IP addresses of different users through the protocol numbers in TCP or UDP or IP packets. True. False.

The "maximum-vty" command of the VTY user interface can configure multiple users to log in to the device through Telnet at the same time. True. False.

The command to configure the country code on the AC is?. nation-code. province-code. country-code. state-code.

The working mode of the AP does not allow switching. True. False.

Which of the following IEEE 802.11 standards support working in the two frequency bands of 2.4GHz and 5GHz? (Multiple choice). 802.11g. 802.11n. 802.11ax. 802.11ac.

Which of the following parameters does LCP negotiation use to detect link loops and other abnormal conditions?. CHAP. MRU. Magic word. PAP.

The tree network topology is actually a hierarchical star structure, which is easy to expand the network scale, but the higher the level, the more serious the network problems caused by node failure. True. False.

When building a campus network, which of the following protocols can be used to avoid Layer 2 loops?. SNMP. NAT. OSPF. RSTP.

The DHCPv6 server supports providing hosts with DNS server addresses and other configuration information. True. False.

What extension headers are supported by IPv6 packets? (Multiple choice). Fragmentation Extension Header. Destination Options Extension Header. VLAN extension header. Hop-by-Hop Options Extension Header.

IPv6 protocol uses NS and NA packets for duplicate address detection (DAD). True. False.

NFV (Network Functional Virtualization), network function virtualization, realizes the deployment of network applications in a software-based manner. True. False.

Which of the following methods can read data non-blockingly in Python's telnetlib?. telnet.read very lazy (). telnet. read all (). telnet.read eager (). telnet. read very eager ().

UDP is connectionless, what protocol must be relied on to ensure the reliability of transmission?. transmission control protocol. Application layer protocol. Network layer protocol. Internet Protocol.

What is the full name of VRP?. Versatile Redundancy Platform. Versatile Routing Protocol. Virtual Routing Platform. Versatile Routing Platform.

Which of the following levels does not belong to the common network level in the medium-sized campus network architecture?. Network layer. Core layer. Aggregation layer. Access layer.

Which statement about the function of the network layer in the OSI reference model is correct?. Transmits a bitstream between devices, specifying levels, speeds, and cable pinouts. The layer closest to the user in the OSI reference model, which provides network services for applications. Provide connection-oriented or non-connection-oriented data transfer and error detection before retransmission. Combine bits into bytes, then combine bytes into frames, use link layer addresses (Ethernet uses MAC addresses) to access media, and perform error detection. Provide a logical address to forward data from source to destination.

Regarding the function of ARP protocol and packet encapsulation, which description is correct?. The ARP protocol supports deployment on PPP links and HDLC links. The ARP protocol is based on Ethernet encapsulation. The MAC address and UUID address of the destination can be obtained through the ARP protocol. The ARP cache on the network device can only be obtained through the ARP protocol.

In an OSPF broadcast network, which routers will a DRother router exchange link state information with? (Multiple choice). BDR. All OSPF neighbors. DR Other. DR.

The broadcast address of the network segment 192.168.1.0/25 is 192.168.1.128. True. False.

Which fields in the IPv4 header are related to fragmentation? (Multiple choice). Flags. TTL. Identification. Fragment Offset.

The last option field (option) of IPv4 is optional information with variable length. The maximum length of this field is?. 10B. 40B. 60B. 20B.

Which of the following statements about default routing is correct? (Multiple choice). If the destination address of the packet cannot match any other routing entry in the routing table, the router will forward the packet according to the default route. In the routing table, the default route appears as a route to network 0.0.0.0 (also with a mask of 0.0.0.0). How a default route must exist in the routing table of a router. The default route can only be manually configured by the administrator.

Which of the following is not included in the routing table?. MAC. NextHop. Cost. Destination/Mask.

Which statement about OSPF protocol area division is wrong?. Dividing OSPF areas can reduce the LSDB size of some routers. The LSDBs in the routers in the same OSPF area are completely consistent. Only ABR can be used as ASBR. Area 0 is the backbone area, and other areas must be connected to this area.

The mask length is 12 bits, which can be expressed as?. 255.240.0.0. 255.255.255.0. 255.248.0.0. 255.255.0.0.

Ethernet frames are processed and forwarded in the form of VLAN TAG inside the switch. True. False.

In the network shown in the figure below, assuming that all routers can enable the OSPF protocol at the same time, which router is the DR in this network?. Router B. Router D. Router A. Router C.

In the switch MAC address table, which of the following entries will not age?. Dynamic MAC address entries. Device MAC address entry. Static MAC address entry. Port MAC address entry.

As shown in the figure, host A and host B want to realize communication between VLANs through single-arm routing, so which configuration should be done under the G0/0/1.1 interface of RTA?. dotlq termination vid 1. dotlq termination vid 10. dotlq termination vid 20. dotlq termination vid 30.

What modes does device link aggregation support? (Multiple choice). Manual load sharing mode. Manual active/standby mode. Blend Mode. ACP mode.