Download New Updated (Spring 2015) Cisco 350-029 Actual Tests 101-110

Ensurepass

 

QUESTION 101

Which three BGP attributes are carried by TLV? (Choose three)

 

A.

Local Preference

B.

Weight

C.

Origin

D.

Network Layer Reachability Information (NLRI)

E.

Multiple Exit Discriminator (MED)

 

Correct Answer: ADE

Explanation:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094bbd.shtml# backinf

 

oBGP uses TLVs to carry attributes such as Network Layer Reachability Information (NLRI), Multiple Exit Discriminator (MED), and local preference.

 

Several routing protocols use TLVs to carry a variety of attributes. Cisco Discovery Protocol (CDP), Label Discovery Protocol (LDP), and Border Gateway Protocol (BGP) are examples of protocols that use TLVs. BGP uses TLVs to carry attributes such as Network Layer Reachability Information (NLRI), Multiple Exit Discriminator (MED), and local preference.

 

 

QUESTION 102

Which three statements about the BGP next-hop attribute are true? (Choose three.)

 

A.

EBGP sessions between confederation sub ASs do not modify the next-hop attribute.

B.

By default, iBGP sessions changethe next-hop attribute learned from eBGP peers to self address.

C.

By default, the next-hop attribute is not changed when a prefix is reflected by the route reflector

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D.

EBGP sessions between confederation sub ASs change the next-hop attribute to peer address.

E.

By default, iBGP sessions preserve the next-hop attribute learned from eBGP peers.

 

Correct Answer: ACE

 

 

 

 

QUESTION 103

DRAG DROP

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Correct Answer:

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QUESTION 104

Which two statements are true about SAFI & AFI?

 

A.

Subsequent Address Family identifier (SAFI) provides additionalinformation about the type of the Network Layer ports carried in the BGP update.

B.

Address Family identifier (AFI) field carries the identity of the Network Layer ports for which the BGP speaker intends to advertise multiple paths.

C.

Subsequent AddressFamily identifier (SAFI) provides additional information about the type of the Network Layer Reachability Information carried in the attribute.

D.

Address Family identifier (AFI) carries the identity of the Network Layer protocol for which the BGP speaker intends to advertise multiple paths.

 

Correct Answer: CD

 

 

QUESTION 105

What are the Address Family Identifier (AFI) and Subsequent Address Family Identifier (SAFI) values for VPNv6?

 

A.

AFI is 2, SAFI is 96

B.

AFI is 2, SAFI is 64

C.

AFI is 1, SAFI is 64

D.

AFI is 1, SAFI is 128

E.

AFI is 2, SAFI is 128

 

Correct Answer: E

 

 

QUESTION 106

In which two ways does the BGP graceful capability preserve prefix information during a restart? (Choose two)

 

A.

The peer router immediately removes the BGP routers that it learned from the restarting router from its BGP routing tables.

B.

The router establishes BGP sessions with other routers and relearns the BGP routes from others that are also capable of graceful restart. The restarting router waits to receive updates from the neighboring routers.

C.

The peer router sends an end-of-RIB message to the restarting router.

D.

The restarting router removes any stale prefixes after the timer for stale entries expires.

E.

The restarting router does not remove any stale prefixes after the timer for stale entries expires.

 

Correct Answer: BD

Explanation:

BGP Graceful Restart for NSF

When an NSF-capable router begins a BGP session with a BGP peer, it sends an OPEN message to the peer.

Included in the message is a declaration that the NSF-capable orNSF-aware router has graceful restart capability. Graceful restart is the mechanism by which BGP routing peers avoid a routing flap following a switchover. If the BGP peer has received this capability, it is aware that the device sending the message is NSF-capable. Both the NSF-capable router and its BGP peer(s) (NSF-aware peers) need to exchange the graceful restart capability in their OPEN messages, at the time of session establishment. If both the peers do not exchange the graceful restart capability, the session will not be graceful restart capable.

 

If the BGP session is lost during the RP switchover, the NSF-aware BGP peer marks all the routes associated with the NSF-capable router as stale; however, it continues to use these routesto make forwardingdecisions for a set period of time. This functionality means that no packets are lost while the newly active RP is waiting for convergence of the routing information with the BGP peers.

 

After an RP switchover occurs, the NSF-capable router reestablishes the session with the BGP peer. In establishing the new session, it sends a new graceful restart message that identifies the NSF-capable router as having restarted. At this point, the routing information is exchanged between the two BGP peers. Once this exchange is complete, the NSF-capable device uses the routing information to update the RIB and the FIB with the new forwarding information. The NSF-aware device uses the network information to remove stale routes from its BGP table. Following that, the BGP protocol is fully converged.

 

If a BGP peer does not support the graceful restart capability, it will ignore the graceful restart capability in an

OPEN message but will establish a BGP session with the NSF-capable device. This functionality will allow interoperability with non-NSF-aware BGP peers (and without NSF functionality), but the BGP session with non-NSF-aware BGP peers will not be graceful restart capable.

 

 

QUESTION 107

What are the two benefits of graceful restart? (Choose two)

 

A.

Graceful restart allows session information recovery without disruption to the network.

B.

A node can perform a graceful restart to help a neighbor recover its state. The label bindings are kept on state information, which helps the failed node recover faster and does not affect the current forward traffic.

C.

Graceful restart allows a node to recover state from its neighbor when there is no RP or before the device undergoes SSO.

D.

Graceful restart does not allow session information recovery.

E.

During a graceful restart, the router removes any stale prefixes after a timer for stale entries expires

 

Correct Answer: AB

 

 

QUESTION 108

Which BGP attribute can be used to influence inbound traffic flow?

 

A.

cluster ID

B.

Weight

C.

MED

D.

local preference

E.

aggregate

 

Correct Answer: C

 

 

QUESTION 109

Which description of BGP authentication is true?

 

A.

MD5 has been used by BGP to encrypt BGP update packets.

B.

BGP uses a message-digest algorithm to authenticate BGP peers

C.

A plain-text password authentication is an option of BGP authentication

D.

EBGP peers authentication is faster than IBGP peers authentication

E.

BGP uses public key and private key to authenticate BGP peers.

 

Correct Answer: B

Explanation:

BGP Authentication

BGP supports MD5 authentication between neighbors, using a shared password.It is configured under BGP router configuration mode with the command neighbor {ip-address | peer-group-name} password password.

When authentication is configured, BGP authenticates every TCP segment from its peer and checks the source of each routing update. Most ISPs require authentication for their EBGP peers.

 

 

QUESTION 110

In which of the following BGP-related events is an End-of-RIB (EOR) message sent? (Choose two.)

 

A.

Following a link flap in the BGP speaker’s AS

B.

During initial convergence.

C.

Following a Route Processor Switchover.

D.

Just before sending a CEASE message to tear down the session.

E.

During capability negotiation

 

Correct Answer: BC

Explanation:

The Peer Router must signal the completion of the initial routing update by sending the End-of-RIB marker (discussed below)

While continuing to forward packets, the Peer Router refreshes the Restarting Router with any relevant BGP updates. The Peer Router indicates completion of this process by sending an End-of-RIB (EOR) marker. The EOR marker for IPv4is a BGP update message that is of the minimum length–23 bytes. The EOR does not contain any routes to be added or withdrawn. Essentially, it is an “empty” update, whose sole purpose is to indicate that all available routes have been sent. The EOR marker helps speed convergence, because it allows the router to begin best-path selection as quickly as possible, without waiting for the timer to expire.

 

Once the Restarting Router has received all available routes from each peer, it can conduct best-path selection, and send any updates to its Peer Routers. The Restarting Router will also use the EOR to indicate the completion of this process.

 

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