What are two purposes of the AS_PATH attribute?（）A、route selectionB、loop avoidanceC、determining equal cost paths for reachabliltyD、defining the application of other BGP attributes

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第3题：

Which two statements about the bgp deterministic-med and bgp always-compare-med commands are true？（）

• A、The bgp deterministic-med command is used to influence the BGP route selection process to cause the MED attribute to have higher precedence over the AS path length
• B、The bgp always-compare command is used to influence the BGP route selection process to cause the MED attribute to have higher precedence over the AS path system
• C、Enabling the bgp deterministic-med command ensures the comparison of the MED variable when choosing routes advertised by different peers in the same autonomous system.
• D、Enabling the bgp always-compare-med command ensures the comparison of the MED variable for paths from neighbors in different autonomous systems.
• E、The bgp deterministic-med and bgp always-compare-med commands are enabled by defult.

正确答案:C,D

第4题：

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 rou ter to ignore some of the routes and not consider them as candidates for the best path?（）

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

正确答案:B,C,F

第5题：

What is the maximum number of equal-cost paths that can be configured for RIP on an ERX Edge Router?（）

• A、4
• B、8
• C、12
• D、16

正确答案:D

第6题：

what’s the role of community attribute in the bgp route？

正确答案: BGP communitiy can be used to as tag of a set of routes. Those tags can be used for applying specific routing policy for a group of routes.
There are four well-known communities：
Internet：all route belongs to this community by default and is advertised freely.
No-export：routes belong to the community cannot be advertised to EBGP peer.
No-advertise：routes belong to the community cannot be advertised to any BGP peer.
Local-as：routes belong to the community cannot be advertised to eBGP peer，or if confederation is used，routes cannot be advertised to conferation eBGP peer and normal eBGP peer.

第7题：

What are two purposes of the RSVP signaling protocol when configuring MPLS Label-Switched Paths (LSPs)? （）(Choose two.)

• A、to perform a label push operation
• B、to track the status of signaled LSPs
• C、to perform longest-match route lookups
• D、to reserve resources, such as labels and path information

正确答案:B,D

第8题：

What is the role of route preference?（）

• A、It is used as a tiebreaker when the same prefix is available through multiple protocols.
• B、It is used to determine the preferred path to a given destination.
• C、It is used to select the best route between multiple equal-cost paths.
• D、It is used to select which routing table to use for forwarding.

正确答案:A

第9题：

You have a single Active Directory directory service domain. You have an application that adds Active Directory Schema attributes during installation. The attributes replicate as part of global catalog replication. Your user account is a member of the Domain Admins， Schema Admins， and Enterprise Admins global groups. You test the application and decide not to deploy it to production.  You need to ensure that the attributes that are added by the application are no longer available in Active Directory.  Using the Active Directory Schema snap-in，what should you do？（）

• A、 Clear the Index this attribute in the Active Directory option for each attribute that is added by the application.
• B、 Clear the Attribute is active option for each attribute that is added by the application.
• C、 Clear the Replicate this attribute to the Global Catalog option for each attribute that is added by the application.
• D、 Clear the Allow this attribute to be shown in advanced view option for each attribute that is added by the application.

正确答案:B

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第15题：

You have two EBGP peers connected via two parallel serial lines. What should you do to be able to load-balance between two EBGP speakers over the parallel serial lines in both directions？ （）

• A、nothing，BGP automatically load-balances the traffic between different autonomous systems on all available links
• B、peer between the eBGP speaker’s loopbacks， configuring eBGP multihop as required， and use an IGP to load-share between the two equal-cost paths between the loopback addresses
• C、configure a loopback as update source for both EBGP peers and have on each AS an IGP to introduce two equal-cost paths to reach the EBGP peer loopback address；it is also necessary to use the next-hop-self command
• D、use the ebgp-load-balance command on the neighbor statement on both sides
• E、configure a loopback as update source for both EBGP peers and have on each AS an IGP to introduce two equal-cost paths to reach the peer loopback address；it is also necessary to use the ebgp-multihop and next-hop-self commands

正确答案:B

第16题：

What are two advantages of BGP route aggregation?（） (Choose two.)

• A、It can reduce routing table size.
• B、It allows for optimal route selection.
• C、It can reduce the number of routing updates.
• D、It always shortens the attribute list for the aggregated route.

正确答案:A,C

第17题：

What is the default maximum number of equal-cost paths that can be placed into the routing of a cisco OSPF router?（）

• A、16
• B、2
• C、unlimited
• D、4

正确答案:D

第18题：

Which two BGP attributes support route reflection？（）

• A、Client ID
• B、Cluster list
• C、Originator ID
• D、Reflection community

正确答案:B,C

第19题：

What is the role of route preference?（）

• A、It is used to determine which route should become active.
• B、It is used to select which routing table to use for forwarding.
• C、It is used to determine what routes to accept into the routing table.
• D、It is used to select the best route between multiple equal cost paths.

正确答案:A

第20题：

What are two uses of the AS Path attribute?（） (Choose two.)

• A、route selection
• B、loop avoidance
• C、determining equal cost paths for reachablilty
• D、defining the application of other BGP attributes

正确答案:A,B

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