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单选题 What is the purpose of the OSPF link-state update packet?()

A

describes a change to the OSPF hello timer

B

carries one or more link-state advertisements

C

establishes and maintains neighbor relationships

D

describes the contents of the entire link-state database

多选题 Firewall filters can be used to accept, discard, or reject packets based on ()

A

protocol type

B

MAC address

C

TCP or UDP port

D

source and destination IP address

单选题 What is the first step in BGP route selection?()

A

The local router prefers the route with the shortest as-path.

B

The router first verifies that it has a route to the bgp Next Hop IP address.

C

The local router prefers the route from the peer with the lowest peer id address.

D

The local router prefers the route learned from an ebgp peer over a route learned from an ibgp peer.

单选题 How often are IS-IS Hello packets transmitted?()

A

3 seconds for DIS; 9 seconds for non-DIS

B

9 seconds for DIS; 3 seconds for non-DIS

C

10 seconds for DIS; 3 seconds for non-DIS

D

10 seconds for all routers

多选题 What are the three components of the ISO NET address?()

A

Area ID

B

N-selector

C

System ID

D

AS number

E

ISO number

F

MAC address

多选题 What are two ways that a valid IBGP peering session can be configured?()

A

via the accept x.x/y command

B

via TCP reachable physical interface addresses

C

via remote loopbacks with the local-address command

D

via UDP with the neighbor x.x.x.x command at the group level

多选题 What are two purposes of the AS_PATH attribute?()

A

route selection

B

loop avoidance

C

determining equal cost paths for reachablilty

D

defining the application of other BGP attributes

单选题 What type of OSPF router is responsible for redistributing routes into OSPF?()

A

ABR

B

ASBR

C

internal router

D

backbone router

单选题 Once the TCP connection is established, which message type initiates the BGP peering process?()

A

Open

B

Active

C

Update

D

Keepalive

E

Notification

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