[2021-New] Cisco 400-101 Dumps With Update Exam Questions (61-70)

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Q1. Which option is the origin code when a route is redistributed into BGP?

A. IGP

B. EGP

C. external

D. incomplete

E. unknown

Answer: D

Q2. Which topology allows the split-horizon rule to be safely disabled when using EIGRP?

A. full mesh

B. partial mesh

C. hub and spoke

D. ring

Answer: C

Q3. Which statement is true about VPLS?

A. MPLS is not required for VPLS to work.

B. VPLS carries packets as Layer 3 multicast.

C. VPLS has been introduced to address some shortcomings of OTV.

D. VPLS requires an MPLS network.

Answer: D

Explanation:

VPLS uses MPLS labels so an MPLS network is required. VPLS MPLS packets have a two-label stack. The outer label is used for normal MPLS forwarding in the service provider's network. If BGP is used to establish the VPLS, the inner label is allocated by a PE as part of a label block. If LDP is used, the inner label is a virtual circuit ID assigned by LDP when it first established a mesh between the participating PEs. Every PE keeps track of assigned inner label, and associates these with the VPLS instance.

Reference: http://en.wikipedia.org/wiki/Virtual_Private_LAN_Service

Q4. DRAG DROP

Drag and drop each IPv6 neighbor discovery message type on the left to the corresponding description on the right.

Answer:

Q5. Which protocol will accept incoming updates when the passive-interface command is configured?

A. OSPF

B. IS-IS

C. RIP

D. EIGRP

Answer: C

Q6. Refer to the exhibit.

Which two statements about the output are true? (Choose two.)

A. 802.1D spanning tree is being used.

B. Setting the priority of this switch to 0 for VLAN 1 would cause it to become the new root.

C. The hello, max-age, and forward delay timers are not set to their default values.

D. Spanning-tree PortFast is enabled on GigabitEthernet1/1.

Answer: A,B

Explanation:

802.1D is the standard for Spanning tree, which is being used here. For priority, The priority order starts from 0 (yes, 0 is valid) and then increases in 4096. 0, 4096, 8192, 12288, …. Etc.

The lower the number is, the higher is the priority. Here we see that the current root has a priority of 8192, so configuring this with a priority of 0 will make it the new root.

Q7. DRAG DROP

What is the correct order of the VSS initialization process? Drag the actions on the left to the correct initialization step on the right.

Answer:

Q8. Which statement about OSPF multiaccess segments is true?

A. The designated router is elected first.

B. The designated and backup designated routers are elected at the same time.

C. The router that sent the first hello message is elected first.

D. The backup designated router is elected first.

Answer: D

Explanation:

According to the RFC, the BDR is actually elected first, followed by the DR. The RFC explains why: “The reason behind the election algorithm’s complexity is the desire for an orderly transition from Backup Designated Router to Designated Router, when the current Designated Router fails. This orderly transition is ensured through the introduction of hysteresis: no new Backup Designated Router can be chosen until the old Backup accepts its new Designated Router responsibilities. The above procedure may elect the same router to be both Designated Router and Backup Designated Router, although that router will never be the calculating router (Router X) itself.”

Reference: http://www.ietf.org/rfc/rfc2328.txt – Page 76

Q9. Which three features does GETVPN support to improve deployment and scalability? (Choose three.)

A. configuration of multiple key servers to work cooperatively

B. allowing traffic to be discarded until a group member registers successfully

C. local exceptions in the traffic classification ACL

D. GDOI protocol configuration between group members and the key server

E. redundant IPsec tunnels between group members and the key server

F. redundant multicast replication streaming through the use of a bypass tunnel

Answer: A,B,C

Q10. Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.)

A. the forwarding information base

B. the label forwarding information base

C. the IP routing table

D. the label information table

E. the adjacency table

Answer: A,B

Explanation:

The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and frames.

The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding Information Base (FIB) is used for IP traffic and the Label FIB is used for MPLS.