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CCIE Routing and Switching Written Exam v5.1

 

QUESTION 451

Which two options are actions that EEM can perform after detecting an event? (Choose two.)

 

A.

Place a port in err-disabled.

B.

Generate an SNMP trap.

C.

Reload the Cisco IOS Software.

D.

Send an SMS.

 

Correct Answer: BC

Explanation:

action snmp-trap

To specify the action of generating a Simple Network Management Protocol (SNMP) trap when an Embedded Event Manager (EEM) applet is triggered, use the action snmp-trap command in applet configuration mode.

ction reload

To specify the action of reloading the Cisco IOS software when an Embedded Event Manager (EEM) applet is triggered, use the action reload command in applet configuration mode.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fs_eem2.html

 

 

QUESTION 452

Which IPv6 tunneling type establishes a permanent link between IPv6 domains over IPv4?

 

A.

IPv4-compatible tunneling

B.

ISATAP tunneling

C.

6to4 tunneling

D.

manual tunneling

 

Correct Answer: D

Explanation:

A manually configured tunnel is equivalent to a permanent link between two IPv6 domains over an IPv4 backbone. The primary use is for stable connections that require regular secure communication between two edge routers or between an end system and an edge router, or for connection to remote IPv6 networks.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/ip6-tunnel.html

 

 

 

 

QUESTION 453

Which two statements about Inverse ARP are true? (Choose two.)

 

A.

It uses the same operation code as ARP.

B.

It uses the same packet format as ARP.

C.

It uses ARP stuffing.

D.

It supports static mapping.

E.

It translates Layer 2 addresses to Layer 3 addresses.

F.

It translates Layer 3 addresses to Layer 2 addresses.

 

Correct Answer: BE

Explanation:

Inverse Address Resolution Protocol (Inverse ARP or InARP) is used to obtain Network Layer addresses (for example, IP addresses) of other nodes from Data Link Layer (Layer 2) addresses.

It is primarily used in Frame Relay (DLCI) and ATM networks, in which Layer 2 addresses of virtual circuits are sometimes obtained from Layer 2 signaling, and the corresponding Layer 3 addresses must be available before those virtual circuits can be used.

Since ARP translates Layer 3 addresses to Layer 2 addresses, InARP may be described as its inverse. In addition, InARP is implemented as a protocol extension to ARP: it uses the same packet format as ARP, but different operation codes.

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

 

 

QUESTION 454

DRAG DROP

Drag and drop the OTV component on the left to the function it performs on the right.

 

clip_image001

 

Correct Answer:

clip_image002

 

 

QUESTION 455

Which statement about how a CE router is used in an MPLS VPN is true?

 

A.

It is located on the customer premises, where it peers and exchanges routes with the provider edge router.

B.

It is located on the provider premises, where it peers and exchanges routes with the customer edge router.

C.

It is located on the customer premises, but it is fully controlled by the provider, which provides a full routing table to the customer.

D.

It is located on the provider premises, and it routes only MPLS label traffic.

 

Correct Answer: A

 

 

QUESTION 456

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

 

 

QUESTION 457

Refer to the exhibit. The spokes of the DMVPN with the given configuration are having QoS issues. Which two actions can you take to resolve the problem? (Choose two.)

 

clip_image004

 

A.

Configure qos pre-classify on the tunnel interface.

B.

Configure an NHRP group on the tunnel interface and associate it to a QoS policy.

C.

Modify the configuration of the IPsec policy to accept QoS policies.

D.

Manually configure a QoS policy on the serial interface.

E.

Configure the bandwidth statement on the tunnel interface.

F.

Configure the bandwidth statement on the serial interface.

 

Correct Answer: AB

Explanation:

It is possible to classify based on information that is encrypted, which is needed in this example. You can use an access-list, configured to match the private subnet behind the remote spoke. The

qos pre-classify command is used on the tunnel interface, and is required because the traffic is classified by a parameter that is encrypted as the traffic leaves the physical outbound interface. L4 information from the IP data packet can also classify traffic destined to the same private subnet.

The “nhrp map group group-name service-policy output parent-policy-name “ command adds the NHRP group to the QoS policy map on the hub.

 

 

QUESTION 458

Refer to the exhibit. Which statement about the route target for 192.168.1.0/24 is true?

 

clip_image006

 

A.

Its route target is 64512:100010051.

B.

Its route targets are 64512:100010051, 64512:2002250, and 64512:3002300.

C.

Its route target is 64512:3002300.

D.

Its route targets are 64512:100010051 and 64512:3002300.

E.

Its route targets are 64512:2002250 and 64512:3002300.

 

Correct Answer: C

Explanation:

Here we are using route maps to change the route target for the 192.168.1.0/24 network from the default route target of 64512:100010051 to 64512:3002300.

 

 

QUESTION 459

Which option describes how a router responds if LSA throttling is configured and it receives the identical LSA before the interval is set?

 

A.

The LSA is added to the OSPF database and a notification is sent to the sending router to slow down its LSA packet updates.

B.

The LSA is added to the OSPF database.

C.

The LSA is ignored.

D.

The LSA is ignored and a notification is sent to the sending router to slow down its LSA packet updates.

 

Correct Answer: C

Explanation:

How OSPF LSA Throttling Works

The timers throttle lsa all command controls the generation (sending) of LSAs. The first LSA is always generated immediately upon an OSPF topology change, and the next LSA generated is controlled by the minimum start interval. The subsequent LSAs generated for the same LSA are rate-limited until the maximum interval is reached. The “same LSA” is defined as an LSA instance that contains the same LSA ID number, LSA type, and advertising router ID. The timers lsa arrival command controls the minimum interval for accepting the same LSA. If an instance of the same LSA arrives sooner than the interval that is set, the LSA is dropped. It is recommended that the arrival interval be less than or equal to the hold-time interval of the timers throttle lsa all command.

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

 

 

QUESTION 460

Which EIGRP configuration results in subsecond failover outside of the basic routing protocol convergence?

 

A.

bfd all-interfaces

B.

timers active-time disabled

C.

timers active-time 1

D.

timers nsf route-hold 20

 

Correct Answer: A

 

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