单选题 What is the purpose of the OSPF link-state update packet?()
describes a change to the OSPF hello timer
carries one or more link-state advertisements
establishes and maintains neighbor relationships
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 ()
protocol type
MAC address
TCP or UDP port
source and destination IP address
单选题 During OSPF adjacency formation, in what state is a router when it is negotiating to be in charge of the database synchronization process?()
Init
2Way
ExStart
Exchange
单选题 What is the first step in BGP route selection?()
The local router prefers the route with the shortest as-path.
The router first verifies that it has a route to the bgp Next Hop IP address.
The local router prefers the route from the peer with the lowest peer id address.
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?()
3 seconds for DIS; 9 seconds for non-DIS
9 seconds for DIS; 3 seconds for non-DIS
10 seconds for DIS; 3 seconds for non-DIS
10 seconds for all routers
多选题 What are the three components of the ISO NET address?()
Area ID
N-selector
System ID
AS number
ISO number
MAC address
多选题 What are two ways that a valid IBGP peering session can be configured?()
via the accept x.x/y command
via TCP reachable physical interface addresses
via remote loopbacks with the local-address command
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?()
route selection
loop avoidance
determining equal cost paths for reachablilty
defining the application of other BGP attributes
单选题 What type of OSPF router is responsible for redistributing routes into OSPF?()
ABR
ASBR
internal router
backbone router
单选题 Once the TCP connection is established, which message type initiates the BGP peering process?()
Open
Active
Update
Keepalive
Notification
公文的发文闭合程序?
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