Estudos HCIABRBR3

Which of the following OSPF protocol packets can ensure the reliability of LSA updates?. LSACK. DD. LSU. LSR.

The last option field of IPv4 is variable-length optional information. What is the maximum length of this field?. 10B. 40B. 60B. 20B.

Which of the following advantages does router-on-a-stick achieve inter-VLAN routing intercommunication?. Reduce the number of equipment. Reduce the use of IP addresses. Reduce the number of link connections. Reduce routing table entries.

If STP is not turned on for the network composed of switches, there must be a Layer 2 loop. True. False.

The switch receives a unicast data frame. If the destination MAC of the data frame can be found in the MAC table, the data frame will be forwarded from the corresponding MAC port. True. False.

The output information of the link aggregation port of a certain switch is as follows. If you want to delete Eth-Trunk 1, which of the following commands is correct?. undo interface Eth-trunk 1. inte GigabitEthernet 0./0/2 Undo eth-trunk Quit Undo interface eth-trunk 1. inte GigabitEthernet 0./0/1 Undo eth-trunk Quit inte GigabitEthernet 0./0/2 Undo eth-trunk Quit. inte GigabitEthernet 0./0/1 Undo eth-trunk Quit Undo interface eth-trunk 1.

Which information of the data frame does the VLANIF interface use to determine whether to perform Layer 2 or Layer 3 forwarding?. Destination MAC. Source MAC. Destination port. Source IP.

If the value of the Type/Length field of an Ethernet data frame is 0 x 0800, the length of the upper layer message header carried by this data frame is in the range of 20-60B. True. False.

When using FTP for file transfer, how many TCP connections will be established?. 2. 1. 3. 4.

What are the user authentication methods that can be deployed in wlan? (Multiple choice). Portal authentication. MAC authentication. Radius certification. 802.1X authentication.

Which of the following IEEE 802.11 standards support operation in the 5GHz frequency band? (Multiple choice). 802.11ac. 802.11n. 802.11g. 802.11a.

In order to join the wireless network STA needs to obtain wireless network information first. Which of the following messages is used by the STA to actively obtain the SSID information?. Probe. Join. Discovery. Beacon.

Broadly speaking, which of the following does the transmission medium that constitutes the wireless local area network wlan not include?. Ray. Radio waves. Infrared. Laser.

Which field of the ipv6 packet header can be used for QoS?. Traffic Class. Payload Length. Version. Next Header.

Connection between switches and hosts, which port link type is often used by the switch?. Access link. Trunk link. Trunk link. Hybrid link.

When using the FTP protocol to upgrade the router software, which of the following transmission mode should be selected?. Binary mode. Byte mode. Text mode. Stream byte mode.

Network shown below, Host A does not configure the gateway, the host B exists gateway ARP cache, which of the following statements are correct?. Enable ARP proxy on the GO/0/1 port of the router, then host A can communicate with host B. Host A and Host B cannot communicate in both directions. The data packet sent by host B with the destination IP address of 10.0.12.1 can be forwarded to host A. The data packet sent by host A with the destination IP address of 11.0.12.1 can be forwarded to host B.

The network structure and OSPF partition is shown in the following figure, in addition to RTA, router RTB, RTC and RTD are ABR routers. True. False.

The network structure and OSPF partition is shown in the following figure, in addition to RTA, router RTB, RTC and RTD are ABR routers. 192.168.176.160/27. 192.168.176.0/25. 192.168.176.96/27. 192.168.176.48/29.

What is the main function of the dynamic routing protocol?. Manage routers. Generate IP address. Dynamically generate routing entries. Control router interface status.

The device port running STP protocol is in Forwarding state. Which of the following statements is correct?. The port not only forwards user traffic but also processes BPDU packets. The port only receives and processes BPDUs, and does not forward user traffic. The port will build a MAC address table based on the received user traffic, but does not forward user traffic. The port not only does not process BPDU packets, but also does not forward user traffic.

Which of the following descriptions about spanning tree designated ports is correct?. The designated port can forward configuration BPDU messages to the network segment connected to it. The port on the root switch must not be a designated port. Each switch has only one designated port. The port on the root switch must be a designated port.

Which of the following statements about link aggregation is correct?. GE electrical interfaces and GE optical interfaces cannot be added to the same Eth-Trurnk interface. Eth-Trurnk interfaces cannot be nested. When two devices are connected, it is necessary to ensure that the link aggregation mode on both devices is the same. GE interface and FE interface cannot be added to the same Eth-Trunk interface.

What is the total length of the VLAN frame format defined by IEEE802.1Q?. 1. 2. 3. 4.

CSS refers to the combination of two switch devices that support cluster features and logically combine them into one switch device. True. False.

The host uses the IP address 192.168.1.2 to access the Internet, which must go through NAT. True. False.

Before the STA associates with the AP, it needs to exchange some messages to obtain the SSID. What are these messages?. Discovery. Beacon. Probe. ResponseProbe Request.

Which of the following statement about MPLS Labe1 statement label is wrong?. The label is encapsulated between the network layer and the transport layer. The tags are carried by the head of the packet, does not contain topology Information. The label is used to uniquely identify the forwarding equivalence class FEC to which a packet belongs. The label is a short identifier with a fixed length. It has only local meaning.

Which of the following refers to network communication? (Multiple choice). Use instant messaging software (such as, QQ, WeChat) to chat with friends. Use a computer to visit the company's official website. Use computer to watch video online. Download emails from the company mailbox to your computer.

In the VRP interface, use the command startup saved-configuration backup.cfg to configure the startup.cfg file for the next startup. True. False.

Which of the following fields does the ARP packet format include? (Multiple choice). HardwareType. Protocol Address of sender. Operation Code. Protocol Type.

Both pwd and dir commands in the VRP operating platform can view the file information under the current directory. True. False.

The OSI reference model from high-level to bottom-level is (). Application layer, transport layer, network layer, data link layer, physical layer. Application layer, session layer, presentation layer, transport layer, network layer, data link layer, physical layer. Application layer, presentation layer, session layer, network layer, transport layer, data link layer, physical layer. Application layer, presentation layer, session layer, transport layer, network layer, data link layer, physical layer.

Which of the following attributes cannot be used as a parameter to measure Cost? (Multiple choice). Bandwidth. Sysname. Delay. Hop count.

A company applies for a Class C address segment, which needs to be evenly distributed to 8 subsidiaries. The largest subsidiary has 14 computers. Different subsidiaries must be in different network segments. The subnet mask should be designed as (). 255.255.255.240. 255.255.255.128. 255.255.255.192. 255.255.255.0.

The priority of the LACP protocol is shown in the figure. Switch A and Switch B adopt LACP mode link aggregation, and all interfaces join the link aggregation group. At the same time, set the maximum number of active ports to 3. Which interface of switch A is not active port?. G0/0/1. G0/0/3. G0/0/0. G0/0/2.

If the Ethernet data frame Length/Type=0X0806, which of the following statement is correct? (Multiple choice). The source MAC address of the data frame must not be FFFF-FFFF-FFFF. The data frame is an IEEE 802.3 frame. The data frame is an Ethernet II frame. The destination MAC address of the data frame may be FFFF-FFFF-FFFF.

VLAN 4095 cannot be created on Huawei switches, and VLAN 1 cannot be created. True. False.

Which of the following port states is not included in the RSTP protocol?. Learning. Forwarding. Discarding. Blocking.

Which statement about the Hybrid port is correct?. When the Hybrid port sends data frames, it must carry VLAN TAG. Hybrid port only receives data frames with VLAN TAG. Hybrid port can strip TAG of VLAN in the direction of the interface. Hybrid port does not require PVID.

What elements can NAPT convert?. MAC address + port number. Only IP address. IP address + port number. Only MAC address.

What are the advantages of using dynamic host configuration protocol DHCP to assign IP addresses? (Multiple choice). Heavy workload and difficult to manage. Reuse of IP address can be realized. Avoid IP address conflicts. When the configuration information changes (such as DNS), only the administrator needs to modify it on the DHCP server to facilitate unified management.

The role of the collaboration layer in the SDN architecture is to complete job deployment based on user intentions. OpenStack belongs to the business collaboration layer. True. False.

Which of the following statement about Python is incorrect?. Is a fully open source high-level programming language. Has a rich third-party library. Have a clear grammatical structure, simple and easy to learn, colleagues run efficiently. can be used for operation and maintenance of automation scripts, Artificial Intelligence, Data science and many other fields.

The administrator has configured the AR2200 as shown in the figure, then which of the following description of the configuration information is correct?. The saved configuration file will be replaced by the running configuration file. If the user wants to clear the next startup configuration file of the device configuration, then should select "N". If the user wants to clear the next startup configuration file of the device configuration, then should select "Y". The next startup file of the device configuration will be retained.

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

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 problem caused by the node failure. True. False.

The routing table is shown in the figure. Which of the following statements is correct? (Multiple choice). The router forwards data packets with the destination IP address 10.0.3.3 from Ethernet0/0/0. Router from Ethernet0/0/0 forwarding destination IP address 10.0.2.2 packet. The router forwards data packets with the destination IP address 10.0.12.1 from Ethernet0/0/0. The NextHop of the destination network 10.0.3.3/32 is not directly connected, so the router will not forward packets with the destination IP address of 10.0.3.3.

The network administrator uses Ping to test the connectivity of the network. Which of the following protocols may be used in this process? (Multiple choice). ICMP. UDP. TCP. ARP.

The router needs to modify the destination IP address in the data packet when forwarding data packets. True. False.

Which of the following description about DD packets and LSA of OSPF is correct? (Multiple choice). The header of an LSA can uniquely identify an LSA. LSA header is only a small part of LSA. DD packet contains detailed information about LSA. The DD packet contains only LSA header information.

Which of the following statement about the main functions of the router is wrong? (Multiple choice). Realize the mutual communication between the same network disconnection equipment. Forwarding according to the source IP address of the received data packet. Establish routing tables through multiple protocols. Guide data forwarding according to the routing table.

In the broadcast network as shown in the figure, OSPF runs on four routers in the same area and on the same network segment. OSPF will automatically elect one DR and multiple BDRs to achieve better backup results. True. False.

The Router ID of the OSPF process takes effect immediately after modification. True. False.

How many types of OSPF messages are there?. 2. 3. 4. 5.

In the network shown in the figure below, switch A and router A are connected through two links, and the two links are aggregated in manual load sharing mode. The aggregated port number is 1, and the aggregated link performs data when forwarding, you need to carry VLAN TAG 100. Switch A uses Trunk link. Which of the following configurations should be used for Switch A?. interface Eth-Trunk1 mode lacp-static port link-type trunk port trunk allow-pass vlan 100 # interface GigabitEthernet0/0/1 eth-trunk 1 # interface GigabitEthernet0/0/2 eth-trunk 1 #. interface Eth-Trunk1 port link-type trunk port trunk allow-pass vlan 100 # interface GigabitEthernet0/0/1 eth-trunk 1 # interface GigabitEthernet0/0/2 eth-trunk 1 #. interface Vlanif100 ip address 10.0.12.1 255.255.255.0. interface Eth-Trunk1 ip address 10.0.12.1 255.255.255.0 #.

By default, the port cost calculated by STP has a certain relationship with the port bandwidth, that is, the greater the bandwidth, the () the cost. greater. Consistent. Not necessarily. smaller.

Which of the following port states does the RSTP protocol include? (Multiple choice). Learning. Discarding. Listening. Forwarding.

In the RSTP standard, in order to improve the convergence speed, the port that the switch is directly connected to the terminal can be defined as ( ). Edge port. Root port. Fast port. Backup port.

The configuration information of a certain port of the switch is shown in the figure, then the port will strip off the VLAN TAG when sending data frames carrying which VLAN?. 4.6. 1.4.5.6. 4.5.6. 1.4.6.

The Backup ports in RSTP may alternatively failed root port. True. False.

As shown in the figure, all four switches run STP, and various parameters adopt default values. If the G0/0/2 port of switch C is blocked and the configuration BPDU cannot be sent through this port, how long will it take for the blocked port in the network to enter the forwarding state?. about 3 seconds. about 50 seconds. about 30 seconds. about 15 seconds.

If the largest number in an ACL rule is 12, by default, the user does not specify a number when configuring a new rule, then what is the number assigned by the system for the new rule?. 13. 14. 15. 16.

Complete the ACL configuration shown in the figure on the router RTA, which of the following description is correct?. The VRP system will not adjust the sequence number, but will first match the rule permit source 20.1.1.0 0.0.0.255. Configuration error, the sequence number of the rules must be configured from small to large. The VRP system will adjust the sequence number of the first rule to 5 according to the configuration sequence. The VRP system will first match the rule by numbering in sequence deny source 20.1.1.0 0.0.0.255.

Using the ACL shown in the figure on the router RTA to match routing entries, which of the following entries will be matched? (Multiple choice). 172.16.1.0/24. 192.17.0.0/24. 172.18.0.0/16. 172.16.1.1/32.

The configuration information of a router is shown in the figure. Which of the following statements are correct? (Multiple choice). The authentication method adopted by the domain with the domain name huawei is local ID. The authorization method for the domain with the domain name huawei is local authorization. Use the username huawei for authentication, the password needs to be 654321. The domain with the domain name huawei does not use the billing plan.

What is the main function of the DNS protocol?. Domain name resolution. File transfer. Remote access. Mail transmission.

What is the data link layer MAC address of each VAP on the AP?. SSID. BSS. ESS. BSSID.

Which of the following does not include the advantages of Wi-Fi 6 compared to Wi-Fi 5?. Higher bandwidth. Lower transmission delay. Higher power consumption. Higher number of access terminals per AP.

PPPoE session can only use CHAP authentication. True. False.

Which of the following types does IPv6 address contain? (Multiple choice). Unicast address. Multicast address. Broadcast address. Anycast address.

Regarding the IPv6 address 2031:0000:720C:0000:0000:09E0:839A:130B, which of the following abbreviations is correct?. 2031:0:720C:0:0:9E:839A:130B. 2031:0:720C::9E0:839A:130B. 2031:0:720C:0:0:9E0:839A:130B. 2031::720C::9E0:839A:130B.

Which of the following protocols does the RA message used by IPv6 stateless autoconfiguration belong to?. IGMPv6. ICMPv6. UDPv6. TCPv6.

When planning the campus network, which of the following mask lengths is recommended for device interconnection IP addresses?. 16. 32. 24. 30.

Which of the following are related to the purpose of encapsulation and decapsulation? (Multiple choice). Encapsulation and decapsulation are important steps to realize different protocol functions. Interworking between different networks. Shorten the length of the message. Encapsulation and decapsulation can complete network fault location.

Which of the following statement about the transport layer protocol is correct? (Multiple choice). UDP is suitable for the transmission of delay-sensitive traffic, and can be reorganized according to the sequence number field in the message header. The range of well-known port numbers is 0-1023. UDP uses the STNOACK flag to request and confirm the establishment of a connection. TCP establish a connection is a three-way handshake process, TCP terminates the connection will have to go through four-way handshake.

Which of the following descriptions about wireless devices is correct?. The wireless device has no wired interface. FIT AP-like independent user access, Authentication, Forwarding services and other functions. Wireless Controller AC-like at the aggregation layer of the entire network, providing high-speed, Safe and Reliable VLAN business. FAT AP generally works with wireless controller.

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

VRP supports OSPF multi-process. If the process number is not specified when 0SPF is enabled, the process number used by default is (). 10. 100. 0. 1.

The network shown in the figure below. The administrator hopes that RTA uses static routing, and preferentially sends data packets to RTB 's Loopback0 interface through G0/0/1 por, while G0/0/2 serves as a backup. So how to configure on RTA to achieve this requirement?. ip route-static 10.0.2.2 255.255.255.255 10.0.12.2 ip route-static 10.0.2.2 255.255.255.255 10.0.21.2 preference 40. ip route-static 10.0.2.2 255.255.255.255 10.0.12.2 preference 70 ip route-static 10.0.2.2 255.255.255.25510.0.21.2. ip route-static 10.0.2.2 255.255.255.255 10.0.12.2 ip route-static 10.0.2.2 255.255.255.255 10.0.21.2. ip route-static 10.0.2.2 255.255.255.255 10.0.12.2 ip route-static 10.0.2.2 255.255.255.255 10.0.21.2 preference 70.

If the broadcast address of a network is 172.16.1.255, then what may its network address be?. 172.16.1.128. 172.16.2.0. 172.16.1.1. 172.86.1.253.

The administrator wants to configure a hundred IP address on the G0/0/0 interface of the router, then which of the following addresses is correct?. 192.168.10.112/30. 237.6.1.2/24. 127.3.1.4/28. 145.4.2.55/26.

The network shown below, it is desirable host traffic network administrator during planning A destined for host B data packets through the router between the G0/0/3 interfaces, the host B to the host PC A data packet through the router Between the G0/0/4 interface, which of the following commands can achieve this requirement? (Multiple choice). RTA : ip route-static 10.0.12.5 255.255.255.252 11.0.12.2 RTB : ip route-static 10.0.12.1 255.255.255.252 11.0.12.5. RTA : ip route-static 10.0.12.5 255.255.255.252 11.0.12.6 RTB : ip route-static 10.0.12.1 255.255.255.252 11.0.12.1. RTA : ip route-static 0.0.0.0 0.0.0.0 11.0.12.2 RTB : ip route-static 0.0.0.0 0.0.0.0 11.0.12.5. RTA : ip route-static 0.0.0.0 0.0.0.0 11.0.12.6 RTB : ip route-static 0.0.0.0 0.0.0.0 11.0.12.1.

In the network as shown in the figure below, the host has an ARP cache. Which of the following statements is correct? (Multiple Choice). The following entries may exist in the ARP cache of host A. 10.0.12.2 MAC-C. The router needs to be configured with static routing, otherwise host A and host B cannot communicate in both directions. The following entries exist in the ARP cache of host A 11.0.12.1 MAC-B. Host A and Host B can communicate in both directions.

Compared with STP, which of the following port roles are newly defined in RSTP? (Multiple choice). Designated port. Root port. Alternate port. Backup port.

The Layer 2 switch is a data link layer device, which can identify the MAC address information in the data frame, forward data according to the MAC address, and record these MAC addresses and corresponding port information in its own MAC address table. True. False.

The two switches shown in the figure below have both enabled the STP protocol. Which port will eventually be in the Blocking state?. G0/0/2 port of SWB. G0/0/3 port of SWB. G0/0/2 port of SWA. G0/0/3 port of SWA.

On Huawei switches, you can use the command vlan batch to create multiple VLANs in batches, simplifying the configuration process. True. False.

As shown in the figure, the two switches use the default parameters to run STP, the configuration command STP root primary is used on switch A, and the configuration command STP priority 0 is used on switch B. Then which port will be blocked?. G0/0/1 of switch B. G0/0/1 of switch A. HUB's G0/0/3. G0/0/2 of switch A.

In the network shown in the figure below, two switches are connected by four links, COPPER refers to electrical interface, and FIBER refers to optical interface. Which of the following two interfaces can achieve link aggregation?. G0/0/2 and G0/0/1. G0/0/3 and FE0/0/3. G0/0/3 and G0/0/1. G0/0/2 and FE0/0/3.

The following statements about the election of active ports in link aggregation LACP mode. Which is correct?. Compare the priority of the interface first, and it is impossible to determine the better one to continue to compare the interface number, the smaller the better. Only compare interface priority. Compare device priority. Only compare interface numbers.

Trunk ports can allow multiple VLANs to pass, including VLAN4096. True. False.

Which of the following parameters is not included in the configuration BPDU of the STP protocol?. Port ID. VLAN ID. Bridge ID. Root ID.

Which of the following options are configured in a Layer 2 ACL? (Multiple choices). rule 10 permit 12-protoco1 arp. rule 25 permit source 192.168.1.1 0.0.0.0. rule 20 permit source-mac 0203-0405-0607. .rule 15 permit vlan-id 100.

A company has 50 private IP addresses. The administrator uses NAT technology to connect the company’s network to the public network, but the company has only one public network address and is not fixed. Which of the following NAT conversion methods meets the needs?. easy-ip. NAPT. Static NAT. Basic NAT.

In the network shown in the figure, the administrator hopes that all hosts cannot access the web service (the port number is 80), and other services are normally accessed, so in the interface configuration of G0/0/1, traffic-filtar outbound needs to define which ACL rule?. acl number 3000 rule 5 deny tcp destination-port eq www rule 10 permit ip #. acl number 3001 rule 5 deny udp destination-port eq www rule 10 permit ip #. acl number 3003 rule 5 permit ip rule 10 deny udp destination-port eq www #. acl number 3002 rule 5 permit ip rule 10 deny tcp destination-port eq www #.

At present, the company has a network administrator, and the AR2200 in the company network can be remotely managed by directly entering the password through Telnet. After the two new network administrators arrived, the company hopes to assign their own user names and passwords to all administrators, as well as different levels of authority. So how should it be done? Multiple choices. Each administrator uses a different public IP address of the device when running the Telnet command. The user authentication mode configured by Telnet must select AAA mode. When configuring each administrator's account, different permission levels need to be configured. Configure three user names and their corresponding passwords in the AAA view.

What is the main function of the DHCP DISCOVER message?. The server's confirmation response to the REQUEST message. The client is used to find the DHCP server. The client requests configuration confirmation, or renews the lease. The DHCP server is used to respond to the DHCP DISCOVER message, which carries various configuration information.

Which of the following network parameters can be assigned by Dynamic Host Configuration Protocol DHCP? (Multiple choices). IP address. Gateway address. Operating system name. DNS address.

In the WLAN architecture, the FIT AP cannot work independently and needs to be managed by the AC. Which of the following protocols are used to communicate between FIT AP and AC?. IPsec. WEP. CAPWAP. WAP.