The following belong to the OSPF special area ______

• A.NSSA area
• B.TotallStub area
• C.Stub area
• D.Backbone area

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The default priority value of OSPF external routing is ________.

• A.100
• B.10
• C.150
• D.255

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M In the network shown in the figure, the default next hop RTC of RTA, and the PBR configuration on RTA is as follows:
polic-based-route pbr_a permit node 10
if-match packet-length 64 100
applip-address next-hop 11.0.0.2
if-match packet-length 101 1000
applip-address next-hop 12.0.0.2
polic-based-route pbr_a dennode 20
Assuming that the strategy has been successfully applied, how will the data stream on RTA be forwarded?

• A.Messages with a message length of 101~1000 bytes will be sent to 12.0.02 according to policy routing
• B.Messages with a message length of 101~1000 bytes will be sent to 11.0.02 according to the default route
• C.Messages with a message length of 64~100 bytes will be sent to 11.0.0.2.
• D.Messages with a message length of 64 to 100 bytes will be sent to 11.0.0.2 according to the default route

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The networking is shown in the figure. RTA and RTB are located in AS 1001, RTC, RTD, and RTE are located in AS 1002. AS 1001 advertises BGP routes 11.11.11.0/24 to AS 1002. The main BGP configurations of RTC and RTD are as follows, if RTE , RTC's interconnection link is interrupted, RTE visits the 11.11.11.0/24 network segment, which wide area link is the priority to go through?
RTC]
bgp 1002
preference 20 170 200
peerRTA as-number 1001
peerRTD as-number 1002
peerRTA route-policsetmed import
route-policsetmed permit node 10
applcost 100
RTD]
bgp 1002
preference 20 170 200
peerRTB as-number 1001
peerRTC as-number 1002
peerRTA route-policsetmed import
route-policsetmed permit node 10
applcost 200

• A.Pass through WAN link 1 first, because eBGP routing on RTC is preferred.
• B.Pass WAN link 2 first, because eBGP routing on RTD takes precedence.
• C.Pass through wide area link 1 first, because RTC's MED 100 is less than RTD's MED 200
• D.Pass WAN link 2 first, because RTD MED 200>RTC MED 100.

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Which of the following statements about the AS_PATH attribute is correct:

• A.AS_PATH is an optional pass attribute
• B.When advertising routes to EBGP neighbors, if the AS_PATH of a route contains the AS number of the opposite end, the route will not be sent to the opposite end
• C.When advertising routes to EBGP neighbors, if the AS_PATH of a route contains the AS number of the opposite end, the route is ignored
• D.All BGP routes must contain AS_PATH, even if AS_PATH is empty

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