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A new backup connection is being deployed on a remote site router. The stability of the connection

has been a concern. In order to provide more information to EIGRP regarding this interface, you

wish to incorporate the “reliability” cost metric in the EIGRP calculation with the command metric

weights 1 0 1 0 1.

What impact will this modification on the remote site router have for other existing EIGRP

neighborships from the same EIGRP domain?

A. Existing neighbors will immediately begin using the new metric.

B. Existing neighbors will use the new metric after clearing the EIGRP neighbors.

C. Existing neighbors will resync, maintaining the neighbor relationship.

D. All existing neighbor relationships will go down.

Answer: D



Refer to the exhibit.

R1 has an EBGP session to ISP 1 and an EBGP session to ISP 2. R1 receives the same prefixes

through both links.

Which configuration should be applied so that the link between R1 and ISP 2 will be preferred for

outgoing traffic (R1 to ISP 2)?

A. Increase local preference on R1 for received routes

B. Decrease local preference on R1 for received routes

C. Increase MED on ISP 2 for received routes

D. Decrease MED on ISP 2 for received routes

Answer: A

Explanation: Explanation

Local preference is an indication to the AS about which path has preference to exit the AS in order

to reach a certain network. A path with higher local preference is preferred more. The default value

of preference is 100.






Refer to the exhibit.

A packet from RTD with destination RTG, is reaching RTB. What is the path this packet will take

from RTB to reach RTG?




D. RTB will not be able to reach RTG since the OSPF configuration is wrong.

Answer: C



Refer to the exhibit.

After a link flap in the network, which two EIGRP neighbors will not be queried for alternative

paths? (Choose two.)







Answer: B,C



Both and are in an EIGRP Stub area

The Enhanced Interior Gateway Routing Protocol (EIGRP) Stub Routing feature improves network

stability, reduces resource utilization, and simplifies stub router configuration.

Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke network,

one or more end (stub) networks are connected to a remote router (the spoke) that is connected to

one or more distribution routers (the hub). The remote router is adjacent only to one or more

distribution routers. The only route for IP traffic to follow into the remote router is through a

distribution router. This type of configuration is commonly used in WAN topologies where the

distribution router is directly connected to a WAN. The distribution router can be connected to

many more remote routers. Often, the distribution router will be connected to 100 or more remote

routers. In a hub and spoke topology, the remote router must forward all nonlocal traffic to a

distribution router, so it becomes unnecessary for the remote router to hold a complete routing

table. Generally, the distribution router need not send anything more than a default route to the

remote router.

When using the EIGRP Stub Routing feature, you need to configure the distribution and remote

routers to use EIGRP, and to configure only the remote router as a stub. Only specified routes are

propagated from the remote (stub) router. The router responds to queries for summaries,

connected routes, redistributed static routes, external routes, and internal routes with the message

“inaccessible.” A router that is configured as a stub will send a special peer information packet to

all neighboring routers to report its status as a stub router. Any neighbor that receives a packet

informing it of the stub status will not query the stub router for any routes, and a router that has a

stub peer will not query that peer. The stub router will depend on the distribution router to send the

proper updates to all peers.




Refer to the exhibit.

What triggered the first SPF recalculation?

A. changes in a router LSA, subnet LSA, and external LSA

B. changes in a router LSA, summary network LSA, and external LSA

C. changes in a router LSA, summary network LSA, and summary ASBR LSA

D. changes in a router LSA, summary ASBR LSA, and external LSA

Answer: B



Is built around links, and any IP prefix change in an area will trigger a full SPF. It advertises IP

information in Router and Network LSAs. The routers thus, advertise both the IP prefix information

(or the connected subnet information) and topology information in the same LSAs. This implies

that if an IP address attached to an interface changes, OSPF routers would have to originate a

Router LSA or a Network LSA, which btw also carries the topology information. This would trigger

a full SPF on all routers in that area, since the same LSAs are flooded to convey topological

change information. This can be an issue with an access router or the one sitting at the edge,

since many stub links can change regularly.

Only changes in interarea, external and NSSA routes result in partial SPF calculation (since type

3, 4, 5 and 7 LSAs only advertise IP prefix information) and thus IS-IS

400-101 VCE Dumps400-101 Practice Test400-101 Exam Questions


What is the first thing that happens when IPv6 is enabled on an interface on a host?

A. A router solicitation is sent on that interface.

B. There is a duplicate address detection on the host interface.

C. The link local address is assigned on the host interface.

D. A neighbor redirect message is sent on the host interface.

Answer: B


Duplicate address detection (DAD) is used to verify that an IPv6 home address is unique on the

LAN before assigning the address to a physical interface (for example, QDIO). z/OS

Communications Server responds to other nodes doing DAD for IP addresses assigned to the






Which command will define a VRF with name \’CCIE\’ in IPv6?

A. ip vrf CCIE

B. ipv6 vrf CCIE

C. vrf definition CCIE

D. ipv6 vrf definition CCIE

Answer: C



On a router, interface S0 is running EIGRPv6, and interface S1 is running OSPFv3. A

redistribution command is issued under OSPFv3, redistribute EIGRP 1 metric 20 under ipv6 router

ospf 1. What will happen after applying this redistribution command?

A. All routes showing up as D and D EX in the routing table will be redistributed into OSPFv3.

B. All routes showing up as D, D EX, and C in the routing table will be redistributed into OSPFv3.

C. All routes showing up as D and D EX in the routing table and the S0 interface will be

redistributed into OSPFv3.

D. All routes showing up as D in the routing table will be redistributed into OSPFv3.

E. All routes showing up as D EX in the routing table will be redistributed into OSPFv3.

Answer: A


D are EIGRP Internal Routes and D EX are EIGRP external routes. Both Internal and External

EIGRP routes will be redistributed with the configuration shown above


Which type of domains is interconnected using Multicast Source Discovery Protocol?





Answer: A

Explanation: Multicast Source Discovery Protocol (MSDP) is a Protocol Independent Multicast

(PIM) family multicast routing protocol defined by Experimental RFC 3618. MSDP interconnects

multiple IPv4 PIM Sparse-Mode (PIM-SM) domains which enables PIM-SM to have Rendezvous

Point (RP) redundancy and inter-domain multicasting.




Which two multicast address ranges are assigned as source-specific multicast destination

addresses and are reserved for use by source-specific applications and protocols? (Choose two.)




D. FF3x::/32

E. FF2x::/32

F. FF3x::/16

Answer: A,D

Explanation: Source-specific multicast (SSM) is a method of delivering multicast packets in which

the only packets that are delivered to a receiver are those originating from a specific source

address requested by the receiver. By so limiting the source, SSM reduces demands on the

network and improves security.

SSM requires that the receiver specify the source address and explicitly excludes the use of the (*,

G) join for all multicast groups in RFC 3376, which is possible only in IPv4\’s IGMPv3 and IPv6\’s


Source-specific multicast is best understood in contrast to any-source multicast (ASM). In the

ASM service model a receiver expresses interest in traffic to a multicast address. The multicast

network must

1. discover all multicast sources sending to that address, and

2. route data from all sources to all interested receivers.

This behavior is particularly well suited to groupware applications where

1. all participants in the group want to be aware of all other participants, and

2. the list of participants is not known in advance.

The source discovery burden on the network can become significant when the number of sources

is large.

In the SSM service model, in addition to the receiver expressing interest in traffic to a multicast

address, the receiver expresses interest in receiving traffic from only one specific source sending

to that multicast address.

This relieves the network of discovering many multicast sources and reduces the amount of

multicast routing information that the network must maintain.

SSM requires support in last-hop routers and in the receiver\’s operating system. SSM support is

not required in other network components, including routers and even the sending host. Interest in

multicast traffic from a specific source is conveyed from hosts to routers using IGMPv3 as

specified in RFC 4607.

SSM destination addresses must be in the ranges for IPv4 or FF3x::/96 for IPv6.



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