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
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  • Jun 18,2018
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Q331. Which two statements about OSPFv3 are true? (Choose two.) 

A. It supports unicast address families for IPv4 and IPv6. 

B. It supports unicast address families for IPv6 only. 

C. It supports only one address family per instance. 

D. It supports the use of a cluster ID for loop prevention. 

E. It supports multicast address families for IPv4 and IPv6. 

F. It supports multicast address families for IPv6 only. 

Answer: A,C 


Q332. Refer to the exhibit. 

Why is network 172.16.1.0/24 not installed in the routing table? 

A. There is no ARP entry for 192.168.1.1. 

B. The router cannot ping 192.168.1.1. 

C. The neighbor 192.168.1.1 just timed out and BGP will flush this prefix the next time that the BGP scanner runs. 

D. There is no route for 192.168.1.1 in the routing table. 

Answer:

Explanation: 

Here we see that the next hop IP address to reach the 172.16.1.0 network advertised by the BGP peer is 192.168.1.1. However, the 192.168.1.1 IP is not in the routing table of R3 so it adds the route to the BGP table but marks it as inaccessible, as shown. 


Q333. Which two statements about packet fragmentation on an IPv6 network are true? (Choose two.) 

A. The fragment header is 64 bits long. 

B. The identification field is 32 bits long. 

C. The fragment header is 32 bits long. 

D. The identification field is 64 bits long. 

E. The MTU must be a minimum of 1280 bytes. 

F. The fragment header is 48 bits long. 

Answer: A,B 

Explanation: 

The fragment header is shown below, being 64 bits total with a 32 bit identification field: 

Reference: http://www.openwall.com/presentations/IPv6/img24.html 


Q334. Which statement about the bgp soft-reconfig-backup command is true? 

A. It requires BGP to store all inbound and outbound updates. 

B. It overrides soft reconfiguration for devices that support inbound soft reconfiguration. 

C. When the peer is unable to store updates, the updates are implemented immediately. 

D. It provides soft reconfiguration capabilities for peers that are unable to support route refresh. 

E. It provides outbound soft reconfiguration for peers. 

Answer:


Q335. Refer to the exhibit. 

Which BGP feature allows R1 to instruct R2 which prefixes it is allowed to advertise to R1? 

A. route refresh 

B. Prefix-Based Outbound Route Filtering 

C. distribute lists 

D. prefix lists 

Answer:


Q336. Refer to the exhibit. 

Which OSPFv3 routes will be visible in the routing table of R2? 

A. 2001:12::1/128 

B. 2001:12::1/128, 2001:112::1/128 

C. 2001:12::2/128 

D. No OSPFv3 routes will be visible. 

Answer:

Explanation: 

The command “ipv6 unicast-routing” needs to be configured on both routers before any IPv6 routes will be seen. 


Q337. What is the function of an EIGRP sequence TLV packet? 

A. to acknowledge a set of sequence numbers during the startup update process 

B. to list the peers that should listen to the next multicast packet during the reliable multicast process 

C. to list the peers that should not listen to the next multicast packet during the reliable multicast process 

D. to define the initial sequence number when bringing up a new peer 

Answer:

Explanation: 

EIGRP sends updates and other information between routers using multicast packets to 224.0.0.10. For example in the topology below, R1 made a change in the topology and it needs to send updates to R2 & R3. It sends multicast packets to EIGRP multicast address 224.0.0.10. Both R2 & R3 can receive the updates and acknowledge back to R1 using unicast. Simple, right? But what if R1 sends out updates, only R2 replies but R3 never does? In the case a router sends out a multicast packet that must be reliable delivered (like in this case), an EIGRP process will wait until the RTO (retransmission timeout) period has passed before beginning a recovery action. This period is calculated from the SRTT (smooth round-trip time). After R1 sends out updates it will wait for this period to expire. Then it makes a list of all the neighbors from which it did not receive an Acknowledgement (ACK). Next it sends out a packet telling these routers stop listening to multicast until they are been notified that it is safe again. Finally the router will begin sending unicast packets with the information to the routers that didn’t answer, continuing until they are caught up. In our example the process will be like this: 

1. R1 sends out updates to 224.0.0.10 

2. R2 responds but R3 does not 

3. R1 waits for the RTO period to expire 

4. R1 then sends out an unreliable-multicast packet, called a sequence TLV (Type-Length-Value) packet, which tells R3 not to listen to multicast packets any more 

5. R1 continues sending any other muticast traffic it has and delivering all traffic, using unicast to R3, until it acknowledges all the packets 

6. Once R3 has caught up, R1 will send another sequence TLV, telling R3 to begin listening to multicast again. The sequence TLV packet contains a list of the nodes that should not listen to multicast packets while the recovery takes place. But notice that the TLV packet in step 6 does not contain any nodes in the list. 

Note. In the case R3 still does not reply in step 4, R1 will attempt to retransmit the unicast 16 times or continue to retransmit until the hold time for the neighbor in question expires. After this time, R1 will declare a retransmission limit exceeded error and will reset the neighbor. 

(Reference: EIGRP for IP: Basic Operation and Configuration) 


Q338. DRAG DROP 

Drag and drop each DHCP term on the left to the corresponding definition on the right. 

Answer: 


Q339. DRAG DROP 

Drag and drop each SNMP security model and level on the left to the corresponding mode of authentication on the right. 

Answer: 


Q340. DRAG DROP 

Drag and drop the IPv6 multicast feature or protocol on the left to the correct address space on the right. 

Answer: 


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