QUESTION: 45

Which of the following descriptions about the RD attribute filter of BGP is correct?

If not configuredRD-filter. However, if this RD-filter is used for filtering, the matching result is deny.
If configuredRD-filter, but the RD of the route does not match any of the RDs defined in the rule, the default matching result is permit.
Multiple rules are matched according to the configuration order.
RD-filter Between configured rules is always "or"Relationship.

Answer(s): C,D

QUESTION: 46

an existing AS-path-filter: ip as-path-filter 1 permit 100( 100)*( 400)*$, The As-path-fiter cannot match which AS-PATH

Properties?

100 200 400
100
100 400
100 400 400 400

Answer(s): A

Explanation:

regular expression
The * mark matches the preceding character 0 or more times, and $ marks the end of the string. All BCDs can match.

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QUESTION: 47

Which of the following descriptions about ISIS' LSP fragmentation extension is correct??

Make ISIS routers generate more LSP fragments to carry more ISISinformation.
ISIS's shard extension pairThe Hello package works just as well.
ISIS score Slice expansion is achieved by adding virtual systems, which can be extended to 1000 virtual systems at most.
ISISroad The maximum number of shards that the router can generate is 1024.

Answer(s): A

Explanation:

when IS- The link state protocol data packet PDU (Protocol Data When the amount of information in the Unit) is too large, the IS-IS router will generate multiple LSP fragments to carry more IS-IS information.
IS-IS LSP fragmentation by LSP LS in IDP Number field for identification, the length of this field is 1 byte. Therefore, an IS-IS process can generate up to 256 LSP fragments, which carry a limited amount of information. As specified in RFC3786, IS-IS can configure virtual SystemID , and generate virtual IS- IS LSPs to carry routing and other information.

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QUESTION: 48

existingRoute-policy is as follows:
ip community-filter 1 permit 100:1 ip as-path-fiter 2 permit ^100$ route-policy test permit node 10 if- match community-filter 1
if-match as-path-fiter 2
apply as-path 200
Which of the above configuration descriptions is correct?

Only when the BGP route carries the community attribute value of 100:1 or the AS-PATH is 100, The BGProad will match the aboveroute The AS-PATH attribute of the -policy matching route will be changed to 200
Only when the BGP route carries the community attribute value of 100:1 and the AS- When PATH is 100, the BGP route will match the aboveThe AS-PATH property of route-policy matching routes will be changed to 200
Only when the BGP route carries an AS-PATH of 100, the BGP route will match the aboveroute- policy. AS_ that matches the route The PATH property will be changed to200
As long as the BGP route carries the community attribute value of 100:1, the BGP routeroad will match the aboveroute-policy matches the AS-PATH attribute of the routeSex will be changed to 200

Answer(s): B

Explanation:

In a routing policy node, if you do not configure ifThe -match clause indicates that the routing information is successfully matched on this node.
If you configure one or more if-match clause, the relationship between each if-match clause is "and", that is, the routing information must satisfy all if-match clauses at the same time, and the node is considered to be successfully matched.
but the command if-match as-path-filter, if-match community-filter, if-match extcommunity-filter, if- match interface and if-match With the exception of route-type, the if-match clauses of these five commands are in an "or" relationship, and they are still related to the if-match clauses of other commands.It is an "and" relationship.
just the same ifBetween -match, and between different if-matches.

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