Free Cisco 642-885 Exam Dumps Questions & Answers

Refer to the exhibit.

XR4 must protect itself from a DOS attack against its BGP process from R1 by using the TTL security feature. Which configuration achieves this goal?

• A.router bgp 100 neighbor 10.10.14.1 ttl-security hops 254
• B.router bgp 100 neighbor 10.10.14.1 ttl-security hops 255
• C.router bgp 100 neighbor 10.10.14.1 ttl-security hops 1
• D.router bgp 100 neighbor 10.10.14.1 ttl-security

A network engineer is working for an ISP and a current eBGP customer requests to enable the BGP TTL security feature. The engineer sees from the current established BGP session that the eBGP peer is directly connected and the ebgp-multihop feature is already in use with a value of one. Which two actions are needed on the Cisco IOS XR router to accomplish the task? (Choose two.)

• A.Enable the BGP TTL security and the BGP peer resets automatically for the change to take effect.
• B.Configure the neighbor with the command ttl-security 254.
• C.Configure the neighbor with the command ttl-security.
• D.Disable the eBGP-multihop feature.
• E.Clear the BGP session for the configuration change to take effect.

Refer to the exhibit.

Router A and Router B are connected via GigabitEthernet interfaces, but they are unable to form an MSDP neighborship. Which two components must be addressed when fixing the MSDP peering issue? (Choose two.)

• A.The router interfaces are PIM-enabled to transport MSDP updates.
• B.A BGP process on each router is present so that MSDP can peer and carry updates.
• C.The MSDP peering on both routers specifies an origin ID so that it can peer.
• D.An msdp default peer is configured on both routers.
• E.The connect-source attribute is configured with a host route under the MSDP process.
• F.The router A loopback interface configures the correct subnet mask.

Which informationdoes the multicast supported router need to forward the multicast traffic over the source or shared tree?

• A.destination address
• B.MDT Data
• C.mGRE headers
• D.source address
• E.multicast address

Which four statements are correct regarding MSDP configurations and operations? (Choose four.)

• A.MSDP peerings on Cisco IOS, IOS-XE, and IOS-XR support MD5 or SHA1 authentication
• B.SA messages are used to advertise active sources in a domain
• C.MSDP establishes neighbor relationships with other MSDP peers using TCP port 639
• D.SA messages are flooded to all other MSDP peers without any restrictions
• E.The MSDP peers are also typically the RPs in respective routing domains.
• F.On Cisco IOS, IOS-XE, and IOS-XR, the router can be configured to cache the SA messages to reduce the join latency