400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
  • Last Updated
  • Jun 18,2018
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[Jan 2018] ccie 400 101 dumps

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Q371. Refer to the exhibit. 

Why is the host unable to obtain an IP address? 

A. IP source guard is configured on the switch port. 

B. The DHCP server pool addresses are configured incorrectly. 

C. DHCP requests are being blocked. 

D. DHCP option 150 is disabled. 


Q372. Which two 802.1D port states are expected in a stable Layer 2 network? (Choose two.) 

A. forwarding 

B. learning 

C. listening 

D. blocking 

E. disabled 

Answer: A,D 

Q373. In IPv6 Path MTU Discovery, which ICMP message is sent by an intermediary router that requires a smaller MTU? 

A. Time Exceeded, with code 1 (fragment reassembly time exceeded) 

B. Packet Too Big 

C. Destination Unreachable, with code 4 (the datagram is too big) 

D. Multicast Termination Router 


Q374. Which statement about NAT64 is true? 

A. NAT64 provides address family translation and translates IPv4 to IPv6 and IPv6 to IPv4. 

B. NAT64 provides address family translation and can translate only IPv6 to IPv4. 

C. NAT64 should be considered as a permanent solution. 

D. NAT64 requires the use of DNS64. 


Q375. Which three benefits does the Cisco Easy Virtual Network provide to an enterprise network? 

(Choose three.) 

A. simplified Layer 3 network virtualization 

B. improved shared services support 

C. enhanced management, troubleshooting, and usability 

D. reduced configuration and deployment time for dot1q trunking 

E. increased network performance and throughput 

F. decreased BGP neighbor configurations 

Answer: A,B,C 

Q376. In which way does the Bridge Assurance mechanism modify the default spanning-tree behavior in an effort to prevent bridging loops? 

A. Received BPDUs are looped back toward the sender to ensure that the link is bidirectional. 

B. If BPDUs are no longer received on a port, the switch immediately sends out a TCN BPDU. 

C. Extended topology information is encoded into all BPDUs. 

D. BPDUs are sent bidirectional on all active network ports, including blocked and alternate ports. 


Q377. Which data plane protocol does EIGRP Over the Top use? 




D. IP-in-IP 



The EIGRP Over the Top solution can be used to ensure connectivity between disparate Enhanced Interior Gateway Routing Protocol (EIGRP) sites. This feature uses EIGRP on the control plane and Locator ID Separation Protocol (LISP) encapsulation on the data plane to route traffic across the underlying WAN architecture. EIGRP is used to distribute routes between customer edge (CE) devices within the network, and the traffic forwarded across the WAN architecture is LISP encapsulated. Therefore, to connect disparate EIGRP sites, you must configure the neighbor command with LISP encapsulation on every CE in the network. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire-xe-3s-book/ire-eigrp-over-the-top.html 

Q378. Refer to the exhibit. 

Your network is suffering excessive output drops. Which two actions can you take to resolve the problem? (Choose two.) 

A. Install a switch with larger buffers. 

B. Configure a different queue set. 

C. Reconfigure the switch buffers. 

D. Configure the server application to use TCP. 

E. Update the server operating system. 

Answer: A,B 


Installing a switch with larger buffers and correctly configuring the buffers can solve output queue problems. 

For each queue we need to configure the assigned buffers. The buffer is like the ‘storage’ space for the interface and we have to divide it among the different queues. This is how to do it: 

mls qos queue-set output <queue set> buffers Q1 Q2 Q3 Q4 

In this example, there is nothing hitting queue 2 or queue 3 so they are not being utilized. 

Q379. Which two DHCP messages are always sent as broadcast? (Choose two.) 






Answer: D,E 


DHCP discovery 

The client broadcasts messages DHCPDISCOVER on the network subnet using the destination address or the specific subnet broadcast address. 

DHCP request 

In response to the DHCP offer, the client replies with a DHCP request, broadcasts to the server, requesting the offered address. A client can receive DHCP offers from multiple servers, but it will accept only one DHCP offer. 

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

Q380. Refer to the exhibit. 

Which IP packets will be accepted from EBGP neighbor 

A. IP packets with a TTL count in the header that is equal to or greater than 253 

B. IP packets with a TTL count in the header that is equal to 253 

C. IP packets with a TTL count in the header that is equal to or greater than 2 

D. IP packets with a TTL count in the header that is equal to 2 



neighbor ip-address ttl-security hops hop-count 


Router(config-router)# neighbor ttl-security hops 2 

Configures the maximum number of hops that separate two peers. 

. The hop-count argument is set to number of hops that separate the local and remote peer. 

If the expected TTL value in the IP packet header is 254, then the number 1 should be configured for the hop-count argument. The range of values is a number from 1 to 254. 

. When this feature is enabled, BGP will accept incoming IP packets with a TTL value that is 

equal to or greater than the expected TTL value. Packets that are not accepted are silently discarded. 

. The example configuration sets the expected incoming TTL value to at least 253, which is 255 minus the TTL value of 2, and this is the minimum TTL value expected from the BGP peer. The local router will accept the peering session from the neighbor only if it is 1 or 2 hops away. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fs_btsh.html 

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