Cisco 400-101 Actual Free Exam Questions & Community Discussion

Exam Code/Number: 400-101
Exam Name/Title: CCIE Routing and Switching Written Exam
Certification Provider: Cisco
Corresponding Certification: CCIE

Exam Questions: 150
Updated On: Jul 11, 2026

Question #33

What mechanism should you choose to prevent unicast flooding?

A. Configure the switch forwarding cache (CAM. timers to be longer than the ARP cache timers.

B. Configure the ARP cache timers to be longer than the switch forwarding cache (CAM. timers.

C. Use control plane policing (CPP. to limit unicast flooding.

D. Make sure that all end systems are connected to the network with a single physical connection.

Discussion 0

Correct Answer: A Vote an answer

Question #34

Which two statements about Cisco HDLC are true? (Choose two)

A. Cisco routers can carry multiple network-layer protocols simultaneously over the same HDLC link

B. Cisco HDLC supports authentication of peering routers on the same HDLC link

C. Cisco HDLC allows routers to negotiate the supported network-layer protocols before sending their packets over an HDLC link

D. Cisco HDLC allows bundling of multiple links between the same pair of routers into a faster communication channel

E. Cisco HDLC is the default encapsulation on Serial and Dialer interfaces.

F. Cisco HDLC is the preferred protocol in multivendor environments.

Discussion 0

Correct Answer: C,E Vote an answer

Question #35

Which condition needs to be met for an eBGP neighborship to be established?

A. reachability between the loopback ip addresses of both routers is required

B. reachability on TCP port 178 between both routers needs to be possible

C. the BGP TTL security feature needs to be taken into account with regards to the number of hops on the path

D. the AS numbers need to be the same

Discussion 0

Correct Answer: C Vote an answer

Question #36

Which three actions are required when configuring NAT-PT? (Choose three.)

A. Specify a ::/96 prefix that will map to an IPv4 address.

B. Specify an IPv4-to-IPv6 translation.

C. Enable NAT-PT globally.

D. Specify a ::/48 prefix that will map to a MAC address.

E. Specify a ::/32 prefix that will map to an IPv6 address.

F. Specify an IPv6-to-IPv4 translation.

Discussion 0

Correct Answer: A,B,F Vote an answer

Question #37

Drag and drop each statement about cisco EEM policies on the left to the right

Discussion 0

Correct Answer:

Question #38

Drag each IS-IS command on the left to its effect on the right.

Discussion 0

Correct Answer:

Question #39

Which three pieces of information are carried on OSPF type 3 LSAs? (Choose three)

A. IP subnet

B. authentication type

C. metric

D. external route tag

E. subnet mask

F. forwarding address

Discussion 0

Correct Answer: C,E,F Vote an answer

Question #40

Refer to the exhibit.

All routers have FULL OSPF adjacencies
Which reason is likely that R3 is missing the 2001:DB8:100:/64 route?

A. R1 has an incorrect area number configured

B. R1 has LSA throttling configured

C. R1 has loop-free alternate routing configured

D. R1 has prefix suppression configured

Discussion 0

Correct Answer: D Vote an answer

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