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Updated Mar 28, 2025 35 Questions 3 Pages

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Question 31 Selectable Answer

What is the difference between a source tree and a shared tree in a multicast environment?

A. To route traffic from source to receiver a source tree uses a link-state routing protocol and a shared tree uses a distance-vector routing protocol.
B. A source tree has its root at the source, and a shared tree has its root at a designated rendezvous point.
C. To stream multicast from source to receiver, a source tree uses PIM-SM and a shared tree uses PIM-D
D. Source trees are the default type for bidirectional PI
E. and PIM-DM uses shared trees by default.

Answer:
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16-5/imc-pim-xe-16-5-book/imc-tech-oview.html

Question 32 Selectable Answer

How does SRv6 function on the control plane?

A. It enables SRH-capable nodes to terminate IPv6 packets at the network egress to carry the SRv6 locator.
B. The Ingress node of the SR domain adds a uSlD format IPv6 header to carry the SRv6 locator.
C. The ingress node of the SR domain swaps the SRv6 header for the IPv6 header
D. The egress node of SR domain imposes a new outer header

Answer:

Question 33 Selectable Answer

Refer to the exhibit.

An engineer is troubleshooting an issue with traffic steering using the color-only automated steering mechanism. BGP is failing to automatically steer traffic into an SR policy with the given color of a route, regardless of the next hop. The layer 2 configuration is correct, and the physical connection between the devices is working normally. Whch additional command sequence must the engineer add to correct the issue?

A. Option A
B. Option B
C. Option C
D. Option D

Answer:

Question 34 Selectable Answer

In a PIM-SM environment, which mechanism determines the traffic that a receiver receives?

A. The receiver explicitly requests its desired traffic from the RP on the shared tree.
B. The receiver explicitly requests traffic from a single source, which responds by forwarding all traffic.
C. The RP on the shared tree floods traffic out of all PIM configured interfaces.
D. The receiver explicitly requests traffic from each desired source, which responds by sending all traffic.

Answer:
Explanation:
A shared tree is built first between receiver and the RP. The receiver is then able to switch to a Source tree as needed.

Question 35 Selectable Answer

Refer to the exhibit.

P1 and PE3 Cisco IOS XR routers are directly connected and have this configuration applied. The BGP session is not coming up. Assume that there is no IP reachability problem and both routers can open tcp port 179 to each other .
Which two actions fix the issue? (Choose two.)

A. Change MD5 to HMAC-SHA1-12
B. Change MD5 to HMAC-ESP
C. Change MD5 to SHA-1
D. Change MD5 to HMAC-MD5
E. Remove the send and accept lifetime under key 1

Answer:
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-0/security/configuration/guide/sc40crsbook_chapter5.html

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300-510

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Implementing Cisco Service Provider Advanced Routing Solutions (SPRI)

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