Download New Updated (July) Cisco 400-101 Actual Test 141-150

Ensurepass

QUESTION 141

Refer to the exhibit. Which statement is true?

 

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A.

BGP peer 10.1.2.3 is performing inbound filtering.

B.

BGP peer 10.1.2.3 is a route reflector.

C.

R1 is a route reflector, but BGP peer 10.1.2.3 is not a route reflector client.

D.

R1 still needs to send an update to the BGP peer 10.1.2.3.

 

Correct Answer: D

Explanation:

On R1 the routing table version (Tbl Ver) for 10.1.2.3 is 1, other routers have version 2, so it needs to send an update to the 10.1.2.3 peer.

 

 

QUESTION 142

Refer to the exhibit. Router A and router B are physically connected over an Ethernet interface, and ISIS is configured as shown. Which option explains why the ISIS neighborship is not getting formed between router A and router B?

 

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A.

same area ID

B.

same N selector

C.

same domain ID

D.

same system ID

 

Correct Answer: D

Explanation:

With IS-IS, the LSP identifier is derived from the system ID (along with the pseudonode ID and LSP number). Each IS is usually configured with one NET and in one area; each system ID within an area must be unique.

The big difference between NSAP style addressing and IP style addressing is that, in general, there will be a single NSAP address for the entire router, whereas with IP there will be one IP address per interface. All ISs and ESs in a routing domain must have system IDs of the same length. All routers in an area must have the same area address. All Level 2 routers must have a unique system ID domain-wide, and all Level 1 routers must have a unique system ID area-wide.

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml

 

 

QUESTION 143

Refer to the exhibit. Which statement is true?

 

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A.

There is no issue with forwarding IPv6 traffic from this router.

B.

IPv6 traffic can be forwarded from this router, but only on Ethernet1/0.

C.

IPv6 unicast routing is not enabled on this router.

D.

Some IPv6 traffic will be blackholed from this router.

 

Correct Answer: D

Explanation:

Here we see that the IPV6 default route shows two different paths to take, one via Ethernet 1/0 and one via Ethernet 0/0. However, only Eth 1/0 shows a next hop IPV6 address (the link local IPV6 address). There is no link local next hop addressed known on Eth 0/0. Therefore, traffic to all destinations will be load balanced over the two paths, but only half of the IPv6 traffic will be sent to the correct upsteam router.

 

 

QUESTION 144

Refer to the exhibit. Which statement is true?

 

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A.

IS-IS has been enabled on R4 for IPv6, single-topology.

B.

IS-IS has been enabled on R4 for IPv6, multitopology.

C.

IS-IS has been enabled on R4 for IPv6, single-topology and multitopology.

D.

R4 advertises IPv6 prefixes, but it does not forward IPv6 traffic, because the protocol has not been enabled under router IS-IS.

 

Correct Answer: A

Explanation:

When working with IPv6 prefixes in IS-IS, you can configure IS-IS to be in a single topology for both IPv4 and IPv6 or to run different topologies for IPv4 and IPv6. By default, IS-IS works in single-topology mode when activating IPv4 and IPv6. This means that the IS-IS topology will be built based on IS Reachability TLVs. When the base topology is built, then IPv4 prefixes (IP Reachability TLV) and IPv6 prefixes (IPv6 Reachability TLV) are added to each node as leaves, without checking if there is IPv6 connectivity between nodes.

Reference: https://blog.initialdraft.com/archives/3381/

 

 

 

 

QUESTION 145

Refer to the exhibit. Why is the neighbor relationship between R2 and R4 shown as ES-IS?

 

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A.

because there is an MTU mismatch between R2 and R4

B.

because interface S3/0 of R4 is configured as L1/L2

C.

because interface S3/0 of R2 is configured as L1

D.

because there is a hello interval mismatch between R2 and R4

 

Correct Answer: C

Explanation:

With IS-IS we will see ES-IS when one of the following is true:

So in this question because we do not know about the other side’s “show CLNS neighbor” A must be the better choose.

 

 

QUESTION 146

Refer to the exhibit. The interface FastEthernet0/1 of both routers R4 and R5 is connected to the same Ethernet segment with a multicast receiver. Which two statements are true? (Choose two)

 

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A.

Multicast traffic that is destined to a receiver with IP address 192.168.2.6 will flow through router R4.

B.

Both routers R4 and R5 will send PIM join messages to the RP.

C.

Only router R5 will send a multicast join message to the RP.

D.

Multicast traffic that is destined to a receiver with IP address 192.168.2.6 will flow through router R5.

 

Correct Answer: CD

Explanation:

Even though R4 is the active HSRP router, traffic will flow through R5 and only R5 will send the join messages. The Multicast DR is elected by the higher IP address or priority. R5 has 192.168.2.2 and R4 has 192.168.2.1. R5 is the DR which send all packets to the RP.

 

 

QUESTION 147

Refer to the exhibit. This is the configuration of the ASBR of area 110.Which option explains why the remote ABR should not translate the type 7 LSA for the prefix 192.168.0.0/16 into a type 5 LSA?

 

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A.

The remote ABR translates all type 7 LSA into type 5 LSA, regardless of any option configured in the ASBR.

B.

The ASBR sets the forwarding address to 0.0.0.0 which instructs the ABR not to translate the LSA into a type 5 LSA.

C.

The ASBR originates a type 7 LSA with age equal to MAXAGE 3600.

D.

The ABR clears the P bit in the header of the type 7 LSA for 192.168.0.0/16.

 

Correct Answer: D

Explanation:

When external routing information is imported into an NSSA, LSA Type 7 is generated by the ASBR and it is flooded within that area only. To further distribute the external information, type 7 LSA is translated into type 5 LSA at the NSSA border. The P-bit in LSA Type 7 field indicates whether the type 7 LSA should be translated. This P-bit is automatically set by the NSSA ABR (also the Forwarding Address (FA) is copied from Type 7 LSA). The P-bit is not set only when the NSSA ASBR and NSSA ABR are the same router for the area . If bit P = 0, then the NSSA ABR must not translate this LSA into Type 5.

he nssa-only keyword instructs the device to instigate Type-7 LSA with cleared P-bit, thereby, preventing LSA translation to Type 5 on NSSA ABR device. NotE. If a router is attached to another AS and is also an NSSA ABR, it may originate a both a type-5 and a type-7 LSA for the same network. The type-5 LSA will be flooded to the backbone and the type-7 will be flooded into the NSSA. If this is the case, the P-bit must be reset (P=0) in the type-7 LSA so the type-7 LSA isn’t again translated into a type-5 LSA by another NSSA ABR.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-e/iro-15-e-book/iro-ospfv3-nssa-cfg.html

 

 

 

QUESTION 148

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

 

Correct Answer: C

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)

 

 

QUESTION 149

What are two reasons to define static peers in EIGRP? (Choose two.)

 

A.

Security requirements do not allow dynamic learning of neighbors.

B.

The link between peers requires multicast packets.

C.

Back-level peers require static definition for successful connection.

D.

The link between peers requires unicast packets.

 

Correct Answer: AD

Explanation:

There are two ways we can create EIGRP neighbor relationship:

+ Use “network ” commanD. this is the more popular way to create EIGRP neighbor relationship. That router will check which interfaces whose IP addresses belong to the and turn EIGRP on that interface. EIGRP messages are sent via multicast packets.

+ Use “neighbor” commanD. The interface(s) that have this command applied no longer send or receive EIGRP multicast packets. EIGRP messages are sent via unicast. The router only accepts EIGRP packets from peers that are explicitly configured with a neighbor statement. Consequently, any messages coming from routers without a corresponding neighbor statement are discarded. This helps prevent the insertion of unauthorized routing peers -> A and D are correct.

 

 

QUESTION 150

Refer to the exhibit. R2 is mutually redistributing between EIGRP and BGP. Which configuration is necessary to enable R1 to see routes from R3?

 

clip_image014

 

A.

The R3 configuration must include ebgp-multihop to the neighbor statement for R2.

B.

The R2 BGP configuration must include bgp redistribute-internal.

C.

R1 must be configured with next-hop-self for the neighbor going to R2.

D.

The AS numbers configured on R1 and R2 must match.

 

Correct Answer: B

Explanation:

Whenever you redistribute from BGP to something else, BGP will only advertise externally learned routes. To allow the redistribution of iBGP routes into an interior gateway protocol such as EIGRP or OSPF, use the bgp redistribute-internal command in router configuration mode.

 

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