CCIE Routing and Switching Written Exam v5.1

 

QUESTION 591

Refer to the exhibit. You are bringing a new MPLS router online and have configured only what is shown to bring LDP up. Assume that the peer has been configured in a similar manner. You verify the LDP peer state and see that there are no neighbors. What will the output of show mpls ldp discovery show?

 

clip_image002

 

A.

Interfaces:

Ethernet0/0 (ldp): xmit

B.

Interfaces:

Ethernet0/0 (ldp): xmit/recv

LDP Id: 25.25.25.2:0; IP addr: 192.168.12.2

C.

Interfaces:

Ethernet0/0 (ldp): xmit/recv

LDP Id: 192.168.12.2:0; no route

D.

Interfaces:

Ethernet0/0 (ldp): xmit/recv

LDP Id: 25.25.25.2:0; no route

Correct Answer: D

 

 

QUESTION 592

Which authentication types does OSPF support?

 

A.

null and clear text

B.

MD5 only

C.

MD5 and clear text

D.

null, clear text, and MD5

E.

clear text only

 

Correct Answer: D

 

 

QUESTION 593

How many address families can a single OSPFv3 instance support?

 

A.

1

B.

2

C.

5

D.

10

 

Correct Answer: A

 

 

QUESTION 594

Refer to the exhibit. If a Layer 3 switch running OSPF in a VRF-lite configuration reports this error, which action can you take to correct the problem?

 

clip_image004

 

A.

Set mls cef maximum-routes in the global configuration.

B.

Add the vrf-lite capability to the OSPF configuration.

C.

Upgrade the Layer 3 switch to a model that can support more routes.

D.

Configure the control plane with a larger memory allocation to support the Cisco Express Forwarding Information Base.

 

Correct Answer: A

 

 

QUESTION 595

In which 802.1D port state are the root bridge, the root port, and the designated port(s) elected?

 

A.

listening

B.

learning

C.

forwarding

D.

blocking

E.

disabled

 

Correct Answer: A

Explanation:

STP switch port states:

Blocking – A port that would cause a switching loop if it were active. No user data is sent or received over a blocking port, but it may go into forwarding mode if the other links in use fail and the spanning tree algorithm determines the port may transition to the forwarding state. BPDU data is still received in blocking state. Prevents the use of looped paths.

Listening – The switch processes BPDUs and awaits possible new information that would cause it to return to the blocking state. It does not populate the MAC address table and it does not forward frames. In this state the root bridge, the root port, and the designated port(s) are elected.

Learning – While the port does not yet forward frames it does learn source addresses from frames received and adds them to the filtering database (switching database). It populates the MAC Address table, but does not forward frames.

Forwarding – A port receiving and sending data, normal operation. STP still monitors incoming BPDUs that would indicate it should return to the blocking state to prevent a loop.

Disabled – Not strictly part of STP, a network administrator can manually disable a port.

 

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

 

 

QUESTION 596

Refer to the exhibit. R1 is configured as shown. R1 is able to establish a neighbor adjacency only with R2. Which addition must you make to the R1 configuration to allow it to establish an adjacency with R3?

 

clip_image006

A.

interface gigabitethernet 0/1

ip address 10.1.0.1 255.255.255.0

ip ospf network point-to-point

B.

interface gigabitethernet 0/1

ip address 10.1.0.1 255.255.255.0

ip ospf 1 area 0

C.

router ospf 1

network 10.1.0.0 0.0.0.255 area 1

D.

router ospf 1

area 0 stub

 


Correct Answer:
B

Explanation:

To enable interfaces and networks with OSPF, the networks need to be specified in the network statement. In the configuration shown, only 10.0.0.0/24 has been enabled, we are missing the network connecting to R3 (10.1.0.0/24).

 

 

QUESTION 597

Refer to the exhibit. If router R1 is functioning as a DHCPv6 server and you enter the command show ipv6 dhcp binding, which two options are pieces of information in the output? (Choose two.)

 

clip_image008

 

A.

The IA PD

B.

The DUID

C.

The prefix pool

D.

The DNS server

E.

The Rapid-Commit setting

 

Correct Answer: AB

Explanation:

In the following example, the show ipv6 dhcp binding command shows information about two clients, including their DUIDs, IAPDs, prefixes, and preferred and valid lifetimes:

Router# show ipv6 dhcp binding

 

Client: FE80::202:FCFF:FEA5:DC39 (GigabitEthernet2/1/0)

DUID. 000300010002FCA5DC1C

IA PD. IA ID 0x00040001, T1 0, T2 0

Prefix: 3FFE:C00:C18:11::/68

preferred lifetime 180, valid lifetime 12345

expires at Nov 08 2002 02:24 PM (12320 seconds)

Client: FE80::202:FCFF:FEA5:C039 (GigabitEthernet2/1/0)

DUID. 000300010002FCA5C01C

IA PD. IA ID 0x00040001, T1 0, T2 0

Prefix: 3FFE:C00:C18:1::/72

preferred lifetime 240, valid lifetime 54321

expires at Nov 09 2002 02:02 AM (54246 seconds)

Prefix: 3FFE:C00:C18:2::/72

preferred lifetime 300, valid lifetime 54333

expires at Nov 09 2002 02:03 AM (54258 seconds)

Prefix: 3FFE:C00:C18:3::/72

preferred lifetime 280, valid lifetime 51111

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/xe-3s/dhcp-xe-3s-book/ip6-dhcp-prefix-xe.html

 

 

QUESTION 598

Which statement about the feasible distance in EIGRP is true?

 

A.

It is the maximum metric that should feasibly be considered for installation in the RIB.

B.

It is the minimum metric to reach the destination as stored in the topology table.

C.

It is the metric that is supplied by the best next ho
p toward the destination.

D.

It is the maximum metric possible based on the maximum hop count that is allowed.

 

Correct Answer: C

 

 

QUESTION 599

Which two options are reasons to manipulate the delay metric instead of the bandwidth metric for EIGRP routing? (Choose two.)

 

A.

Because the delay metric provides better handling for bursty traffic

B.

Because manipulating the bandwidth metric can also affect QoS

C.

Because manipulating the bandwidth affects only a particular path

D.

Because changes to the delay metric are propagated to all neighbors on a segment

 

Correct Answer: BD

Explanation:

Using the bandwidth to influence EIGRP paths is discouraged for two reasons:

Changing the bandwidth can have impact beyond affecting the EIGRP metrics. For example, quality of service (QoS) also looks at the bandwidth on an interface.

EIGRP throttles to use 50 percent of the configured bandwidth. Lowering the bandwidth can cause problems like staving EIGRP neighbors from getting hello packets because of the throttling back.

Because changes to the delay metric are propagated to all downstream routers, changing the interface delay parameter is the preferred method of influencing path selection.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13673-14.html

 

 

QUESTION 600

Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.)

 

A.

BGP

B.

EIGRP

C.

Static routing

D.

OSPF

E.

IS-IS

 

Correct Answer: DE

Explanation:

Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route–an exact matching route, or a less specific route–in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP-routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-piro.html

 

Free VCE & PDF File for Cisco 400-101 Practice Test

Instant Access to Free VCE Files: CCNA | CCNP | CCIE …
Instant Access to Free PDF Files: CCNA | CCNP | CCIE …