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CCIE Routing and Switching Written Exam v5.1

 

QUESTION 371

What is the hop limit for an MLD message?

 

A.

1

B.

2

C.

15

D.

255

 

Correct Answer: A

Explanation:

MLD uses the Internet Control Message Protocol (ICMP) to carry its messages. All MLD messages are link-local with a hop limit of 1, and they all have the alert option set. The alert option implies an implementation of the hop-by-hop option header.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_lsm/configuration/xe-3s/imc-lsm-xe-3s-book/ipv6-mcast-mld-xe.html

 

 

QUESTION 372

Which two OSPF LSA types are flooded within the originating area? (Choose two.)

 

A.

type 1, Router LSA

B.

type 2, Network LSA

C.

type 3, Network Summary LSA

D.

type 4, ASBR Summary LSA

E.

type 6, Group Membership LSA

F.

type 9, Opaque LSA

 

Correct Answer: AB

Explanation:

OSPF relies on several types of Link State Advertisements (LSAs) to communicate link state information between neighbors. A brief review of the most applicable LSA types:

Type 1 – Represents a router

Type 2 – Represents the pseudonode (designated router) for a multiaccess link

Type 3 – A network link summary (internal route)

Type 4 – Represents an ASBR

Type 5 – A route external to the OSPF domain

Type 7 – Used in stub areas in place of a type 5 LSA

LSA types 1 and 2 are found in all areas, and are never flooded outside of an area. They are only flooded within the area that they originated from.

Reference: http://packetlife.net/blog/2008/jun/24/ospf-area-types/

 

 

QUESTION 373

Which statement about the NHRP network ID is true?

 

A.

It is sent from the spoke to the hub to identify the spoke as a member of the same NHRP domain.

B.

It is sent from the hub to the spoke to identify the hub as a member of the same NHRP domain.

C.

It is sent between spokes to identify the spokes as members of the same NHRP domain.

D.

It is a locally significant ID used to define the NHRP domain for an interface.

 

Correct Answer: D

Explanation:

The NHRP network ID is used to define the NHRP domain for an NHRP interface and differentiate between multiple NHRP domains or networks, when two or more NHRP domains (GRE tunnel interfaces) are available on the same NHRP node (router). The NHRP network ID is used to help keep two NHRP networks (clouds) separate from each other when both are configured on the same router.

The NHRP network ID is a local only parameter. It is significant only to the local router and it is not transmitted in NHRP packets to other NHRP nodes. For this reason the actual value of the NHRP network ID configured on a router need not match the same NHRP network ID on another router where both of these routers are in the same NHRP domain. As NHRP packets arrive on a GRE interface, they are assigned to the local NHRP domain in the NHRP network ID that is configured on that interface.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html

 

 

QUESTION 374

Which three options are three of the default EIGRP administrative distances? (Choose three.)

 

A.

Internal, 90

B.

External, 170

C.

Summary, 5

D.

Outside Local, 100

E.

Inside Local, 180

F.

Inside Global, 1

 

Correct Answer: ABC

Explanation:

The following table lists the default administrative distances for various routing protocols used on Cisco routers.

Routing Protocol

Administrative distance

Directly connected interface

0

Static route out an interface

1

Static route to next-hop address

1

DMNR – Dynamic Mobile Network Routing

3

EIGRP summary route

5

External BGP

20

Internal EIGRP

90

IGRP

100

OSPF

110

IS-IS

115

Routing Information Protocol (RIP)

120

Exterior Gateway Protocol (EGP)

140

On Demand Routing (ODR)

160

External EIGRP

170

Internal BGP

200

Floating Static Route (ex. DHCP-learned)

254

Unknown

255

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

 

 

QUESTION 375

Refer to the exhibit. You are configuring the S1 switch for the switchport connecting to the client computer. Which option describes the effect of the command mls qos map cos-dscp 0 8 16 24 32 40 46 56?

 

clip_image002

 

A.

Voice traffic is excluded from the default priority queue.

B.

Voice packets are given a class selector of 5.

C.

Video conferencing is marked CS3.

D.

Voice packets are processed in the priority queue.

 

Correct Answer: A

Explanation:

The default CoS to DSCP mappings are shown below:

 

Default CoS-to-DSCP Map

CoS Value

DSCP Value

0

0

1

8

2

16

3

24

4

32

5

40

6

48

7

56

 

In our example, we see that COS 6 is mapped to DSCP, not the default of DSCP 48 as shown above. DSCP 46 is Expedited Forwarding (EF), which is typically used for voice traffic, and this value has not been included in this class map.

 

 

QUESTION 376

Refer to the exhibit. R1, R2, and R3 have full network connectivity to each other, but R2 prefers the path through R3 to reach network 172.17.1.0/24. Which two actions can you take so that R2 prefers the path through R1 to reach 172.17.1.0/24? (Choose two.)

 

clip_image004

A.

Set the reference bandwidth to 10000 on R1, R2, and R3.

B.

Configure the cost on the link between R1 and R3 to be greater than 100 Mbps.

C.

Set the reference bandwidth on R2 only.

D.

Configure a manual bandwidth statement with a value of 1 Gbps on the link between R1 and R3.

E.

Modify the cost on the link between R1 and R2 to be greater than 10 Gbps.

F.

Configure a manual bandwidth statement with a value of 100 Mbps on the link between R1 and R2.

 

Correct Answer: AB< /span>

Explanation:

By default, the reference bandwidth used in Cisco routers is 100Mbps, so FastEthernet and above will have a cost of 1, so a gigabit interface and 10GE interface will be equal with a fastethernet. This is not ideal. If we change the reference bandwidth to 100000 then the faster links will be used. Changing the reference bandwidth needs to be done on all routers in the OSPF network. Increasing the cost on the R1-R3 link will also cause the traffic to take the more direct route.

 

 

QUESTION 377

DRAG DROP

clip_image006

 

Correct Answer:

clip_image008

 

 

QUESTION 378

Which two statements about MAC ACLs are true? (Choose two.)

 

A.

They support only inbound filtering.

B.

They support both inbound and outbound filtering.

C.

They are configured with the command mac access-list standard.

D.

They can filter non-IP traffic on a VLAN and on a physical interface.

 

Correct Answer: AD

Explanation:

MAC ACL, also known as Ethernet ACL, can filter non-IP traffic on a VLAN and on a physical Layer 2 interface by using MAC addresses in a named MAC extended ACL. The steps to configure a MAC ACL are similar to those of extended named ACLs. MAC ACL supports only inbound traffic filtering.

Reference: http://www.ciscopress.com/articles/article.asp?p=1181682&seqNum=4

 

 

QUESTION 379

Refer to the exhibit. R2 is unable to access the 172.16.1.0/30 network between R1 and R3. Which option is a possible reason for the failure?

 

clip_image010

 

A.

The seed metric for redistributing into RIP on R3 is missing.

B.

The OSPF processes on R2 and R3 are different.

C.

Auto-summary is misconfigured under the RIP process of R3.

D.

The subnet mask on the link between R2 and R3 is smaller than /30.

E.

The wildcard mask on R3 is misconfigured.

 

Correct Answer: A

Explanation:

The problem is that RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a “starter metric” that gives the RIP process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP’s sole metric is hop count.

< font style="font-size: 10pt" color="#000000">Reference: http://www.thebryantadvantage.com/CCNP%20Certification%20BSCI%20Exam%20Tutorial%20Route%20Redistribution%20Seed%20Metric.htm

 

 

QUESTION 380

As a best practice, when a router is configured as an EIGRP Stub, which routes should be received from its distribution neighbor?

 

A.

the default route

B.

static routes

C.

internal routes only

D.

internal and external routes

 

Correct Answer: A

Explanation:

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.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/eigrpstb.html

 

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