16 04 2014

QUESTION 91
Which BGP attribute will not be advertised in routing updates to its neighboring routers? Select the best response.

A.    weight
B.    local preference
C.    origin
D.    AS_path
E.    next hop

Answer: A

QUESTION 92
What are two Cisco IOS commands that can be used to view neighbor adjacencies? (Choose two.)

A.    show ip ospf database
B.    show ip ospf neighbors
C.    show ip ospf protocols
D.    show ip ospf interfaces

Answer: BD
QUESTION 93
Which statement is true about IBGP routers? Select the best response.

A.    They must be fully meshed.
B.    They can be in a different AS.
C.    They must be directly connected.
D.    They do not need to be directly connected.

Answer: D
Explanation:
When two routers establish a TCP enabled BGP connection, they are called neighbors or peers. Each router running BGP is called a BGP speaker. Peer routers exchange multiple messages to open and confirm the connection parameters, such as the version of BGP to be used. If there are any disagreements between the peers, notification errors are sent and the connection fails. To be a neighbor of BGP no need to be directly connected.

QUESTION 94
How is network layer addressing accomplished in the OSI protocol suite? Select the best response.

A.    Internet Protocol address
B.    Media Access Control address
C.    Packet Layer Protocol address
D.    Network Service Access Point address
E.    Authority and Format Identifier address

Answer: D
Explanation:
OSI network-layer addressing is implemented by using two types of hierarchical addresses:
network service access-point addresses and network-entity titles.
A network service-access point (NSAP) is a conceptual point on the boundary between the network and the transport layers. The NSAP is the location at which OSI network services are provided to the transport layer. Each transport-layer entity is assigned a single NSAP, which is individually addressed in an OSI internetwork using NSAP addresses.

QUESTION 95
When an IPv6 enabled host boots, it sends a router solicitation (RS) message. An IPv6 router responds with a router advertisement (RA).
Which two items are contained in the RA? (Choose two.)

A.    IPv6 address for the host
B.    lifetime of the prefix
C.    prefixes for the link
D.    keepalive timers
E.    request for the local host IP address
F.    any route advertisements it has received

Answer: BC
Explanation:
In IP Version 6, Router Advertisements have the following attributes:
Routers advertise periodically
Max. time between advertisements can be in the range from 4 and 1800 seconds
The advertisement has a lifetime (= 0 if not a default router)
Advertisement contains one or more prefixes
Prefixes have a lifetime
Preferred lifetime
Valid lifetime
Specifies if stateful or stateless autoconfiguration is to be used
Plays a key role in site renumbering

QUESTION 96
Which statement is true about EBGP? Select the best response.

A.    An internal routing protocol can be used to reach an EBGP neighbor.
B.    The next hop does not change when BGP updates are exchanged between EBGP neighbors.
C.    A static route can be used to form an adjacency between neighbors.
D.    EBGP requires a full mesh.

Answer: C
Explanation:
When BGP is running between routers in different autonomous systems, it is called External BGP (EBGP). When BGP is running between routers in the same AS, it is called Internal BGP (IBGP). BGP allows the path that packets take to be manipulated by the AS, as described in this module. It is important to understand how BGP works to avoid creating problems for your AS as a result of running BGP.

QUESTION 97
Which two statements are true about IBGP neighbor relationships? (Choose two.)

A.    An EGP or static routing is required between IBGP neighbors.
B.    A full-mesh IBGP requires that neighbor relationships be established between all BGP enabled
routers in the autonomous system.
C.    IBGP neighbors must be in different autonomous systems.
D.    The BGP split-horizon rule specifies that routes learned via EBGP are never propagated to other
IBGP peers.
E.    The BGP split horizon rule specifies that routes learned via IBGP are never propagated to other
IBGP peers.

Answer: BE
Explanation:
http://packetlife.net/wiki/bgp/ (see confederations)

QUESTION 98
An administrator types in the command router ospf 1 and receives the error message:
"OSPF process 1 cannot start." (Output is omitted.)
What should be done to correctly set up OSPF? Select the best response.

A.    Ensure that an interface has been configured with an IP address.
B.    Ensure that an interface has been configured with an IP address and is up.
C.    Ensure that IP classless is enabled.
D.    Ensure that the interfaces can ping their directly connected neighbors.

Answer: B

QUESTION 99
Which IPv6 address correctly compresses the IPv6 unicast address 2001:0:0:0:0DB8:0:0:417A? Select the best response.

A.    2001:0DB8:417A
B.    2001::0DB8::417A
C.    2001:::0DB8::417A
D.    2001:0DB8:0:0:417A
E.    2001::DB8:0:0:417A
F.    2001:::0DB8:0:0:417A

Answer: E
Explanation:
The point of this question is the about the different form of Ipv6 address. The IPv6 address is 128 bits long, written as eight 16-bit pieces, separated by colons. Each piece
is represented by four hexadecimal digits. You can compact multiple contiguous fields of zero even further. This is the exception to the rule that at least one digit must be present in every field. You can replace multiple fields of zeros with double colons (::). Note that :: can replace only one set of contiguous zero fields. Multiple ::s would make the address ambiguous.

QUESTION 100
A router is running BGP and receives more than one route for a particular prefix.Assume all the routes for this prefix have the same attributes. Which three path features would be reasons be for the router to ignore some of the routes and not consider them as candidates for the best path? (Choose three.)

A.    paths that are marked as synchronized in the show ip bgp output
B.    paths that are marked as not synchronized in the show ip bgp output
C.    paths for which the NEXT_HOP is accessible
D.    paths for which the NEXT_HOP is inaccessible
E.    paths from an external BGP (eBGP) neighbor if the local autonomous system (AS) appears in
the AS_PATH
F.    paths from an internal BGP (iBGP) neighbor if the local autonomous system (AS) appears in
the AS_PATH

Answer: BDE
Explanation:
Only synchronized routes (answer B) with no AS loops (answer E) and a valid next hop (answer D) will be considered as candidates for the best path route selection decision process.

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