QUESTION 81
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers. The IPv6 address of Loopback0 on R4 is 2000::4/128. The ipv6 summary 2000::64 level-2 command is configured in the IS-IS processes of R2 and R1. The ipv6 import-route isis level-2 into level-1 command is configured in the IS IS-IS processes of R1, R2, and R3. Which of the following routers have the route 2000::/64 in their routing tables?

A. R2
B. R4
C. R5
D. R3

Correct Answer: CD
QUESTION 82
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers. The IPv6 address of Loopback0 on R4 is 2000::4/128. The ipv6 summary 2000::64 level-1-2 command is configured in the IS-IS processes of R2 and R1. Which of the following statements is false?

A. The routing table of R1 contains the route 2000::/64.
B. The routing table of R2 contains the route 2000::4/128.
C. The routing table of R3 contains the route 2000::4/128.
D. The routing table of R2 contains the route 2000::/64.

Correct Answer: D
QUESTION 83
If MAC address flapping occurs frequently on a network within a short period of time, there may be loops on the network. STP can be used to eliminate Layer 2 loops.

A. TRUE
B. FALSE

Correct Answer: B
QUESTION 84
The network administrator configures DHCP snooping on an access switch. Which of the following solutions can be used to reduce the impact of denial of service (Dos) on the DHCP server caused by malicious IP address requests of attackers?

A. Configure DHCP snooping to check the CHADDR field in DHCP request packets.
B. Configure DHCP snooping to limit the number of MAC addresses learned by interfaces on the switch.
C. Configure the switch interface connected to the authorized DHCP server as a trusted interface.
D. Enable the device to generate static MAC address entries for interfaces based on DHCP snooping binding entries.

Correct Answer: ABD
QUESTION 85
On a BGP/MPLS IP VPN network, VPNv4 routes carry the export RT. Which of the following attributes is used by MP-BGP to carry the export RT?

A. AS_Path
B. Extended_Community
C. MP_REACH NLRI
D. Local Preference

Correct Answer: B

QUESTION 86
The MPLS architecture consists of the control plane and forwarding plane, each of which contains multiple protocols and entries. Which of the following tables is used to forward MPLS labeled packets?

A. LFIB
B. FIB
C. RIB
D. LIB

Correct Answer: A
QUESTION 87
An administrator runs the display mpls Isp command to view LSPs on a device. The command output is shown in the figure. Which of the following statements are true?

A. Traffic sent from GE0/0/1 of the device to 3.3.3.3 does not carry any label.
B. For the traffic destined for 1.1.1.1, the device is the last hop, that is, the egress device.
C. Traffic sent from GE0/0/0 of the device to 1.1.1.1 carries label 1026.

D. For the traffic destined for 3.3.3.3, the device is the penultimate transit device.

Correct Answer: AD
QUESTION 88
An LDP session has been established between two devices. If the administrator changes the transport address of one device, the LDP session is interrupted, causing service interruption.

A. TRUE
B. FALSE

Correct Answer: A
QUESTION 89
RD and RT are introduced to BGP/MPLS IP VPN networks. Which of the following statements are true about RD and RT?

A. A VPNv4 address is 96 bits long, and an RD is 64 bits long.
B. An RD is not used to identify the origin of a route or determine the VPN instance to which the route should be added.
C. A VPNv4 route can contain only one RD and one RT.
D. An RD is added in front of an IPv4 address to resolve IPv4 address conflicts.

Correct Answer: ABD
QUESTION 90
R1 forwards the packet with the destination IP address of 4.4.4.4 on an MPLS network. Some LSP information of R3 is shown in the figure. During packet transmission, which of the following devices perform MPLS label operations?

A. R4
B. R1
C. R3
D. R2

Correct Answer: BCD
QUESTION 91
On a BGP/MPLS IP VPN network, PEs can use BGP-4 to advertise VPNv4 routes to each other.

A. TRUE
B. FALSE

Correct Answer: B
QUESTION 92
An MPLS label is a 20-bit identifier. When an administrator configures a static LSP, the label values of different MPLS devices cannot overlap.

A. TRUE
B. FALSE

Correct Answer: A
QUESTION 93
MPLS needs to distribute labels to packets and establish LSPs before it can forward packets. LSP’s are classified into static LSPs and dynamic LSPs. Which of the following protocols can be used to establish dynamic LSPs?

A. RSVP-TE
B. IS-IS
C. PIM-SM
D. LDP

Correct Answer: AD
QUESTION 94
On the enterprise network shown in the figure, R3 is connected to the NMS, and all devices on the network communicate with the NMS through a VPN. During an inspection, it is found that R3 has redundant RTs configured. Which of the following commands can be run on R3 to delete the redundant RTs without affecting the connectivity between all devices and the NMS?

A. undo vpn-target 1:3 export-extcommunity
B. undo vpn-target 2:3 export-extcommunity
C. undo vpn-target 1:3 import-extcommunity
D. undo vpn-target 3:1 import-extcommunity

Correct Answer: ABD
QUESTION 95
The figure shows the file information on R2. When a network engineer runs the dir | include 4 command to view the file information, which of the following files will be displayed?

A. 3.zip
B. 3.dat
C. 2.cfg
D. 4.zip

Correct Answer: BD
QUESTION 96
A network engineer finds that link fault alarms are frequently generated on an Ethernet interface of a device. Which of the following commands can be used to check the transmit power and receive power of the interface?

A. display temperature
B. display pon-transceiver
C. display alarm all
D. display transceiver

Correct Answer: D
QUESTION 97
Information generated by a device can be exported to the console, remote terminal, log buffer, log file, and SNMP agent. Which of the following items can receive traps by default?

A. SNMP agent
B. Trap buffer
C. Remote terminal
D. Console

Correct Answer: ABCD
QUESTION 98
When handling a fault on the live network, a network engineer draws a topology shown in the figure, where all routers run OSPF. Which of the following shows the correct access paths between PC1 and PC2?

A. PC1-to-PC2 path: PC1 -> R1 -> R3-> R2 -> PC2; PC2-to-PC1 path: PC2 -> R2-> R1 -> PC1
B. PC1-to-PC2 path: PC1 -> R1 -> R2 -> PC2; PC2-to-PC1 path: PC2 -> R2 -> R1 -> PC1
C. PC1-to-PC2 path: PC1 -> R1 -> R2 -> PC2; PC2-to-PC1 path: PC2 -> R2-> R3 -> R1 -> PC1
D. PC1-to-PC2 path: PC1 -> R1 -> R3 -> R2 -> PC2; PC2-to-PC1 path: PC: R2 -> R3 -> R1 -> PC1

Correct Answer: C
QUESTION 99
Which of the following y cause a failure for the local device to learn ARP information from the peer device?

A. The link transmission is unstable or the optical power is insufficient.
B. The local device is subject to an ARP attack.
C. The physical layer of the interface on the local device is not up.
D. The IP address of the interface on the local device is not on the same network segment as the IP address of the peer device.

Correct Answer: ABCD
QUESTION 100
A NetEngine AR router can function as a DHCP server to allocate IP addresses to clients on the same or different network segments. Which of the following is not a possible cause when a client fails to obtain an IP address?

A. The IP address lease time is less than 24 hours.
B. The link between the client and the server is faulty.
C. DHCP is not enabled on the router.
D. No IP address is available in the address pool.

Correct Answer: A