Cisco 400-201 Exam Braindumps

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Question No. 1

An operations engineer identifies a device is receiving a section loss signal alarm for a SONET link. Which action does the engineer perform?

Answer: C

Question No. 2

In which three scenarios does multihoming in IS-IS work? (Choose three.)

Answer: A, B, C

Question No. 3

Which statement about Software Maintenance Upgrade is true?

Answer: E

1.4. SP high end product

SMUs for each release are individually downloadable from, whereas the bootable files and optional PIEs come in the form of a tarball.

SMUs are release specific. If an issue affects multiple platforms or releases, an SMU will be separately built for each release and each platform depending on the mission-critical need.

A CRS-1 SMU cannot be applied to a different platform, and vice versa.

SMUs provide software fixes for critical network-down and qualification-blocking issues. Therefore, every software defect will not have a corresponding SMU.

Question No. 4

Which option is the benefit of per-link LFA over per-prefix LFA?

Answer: C

Question No. 5

In MPLS-enabled networks, which two improvements does EVPN provide compared to traditional VPLS solutions? (Choose two)

Answer: C, E

Question No. 6

A network has a single exit and is using a default route An operator is worried about denial of service at the network border Which unicastRPF check mode must the operator apply at the border for optimal protection?

Answer: E

Question No. 7

In relation to MPLS Multicast VPN, which three statements about multicast distribution tree (MDT) groups are true? (Choose three.)

Answer: B, C, E

Question No. 8

In an inter-AS L3VPN Option B, the PE-ASBRs use which routing table to store all the VPN routes that need to be exchanged?

Answer: B

Question No. 9

Refer to the exhibit

Refer to the exhibit. How can IPv4 hosts located on the IPv4 Internet access the IPv6-only servers located in a small IPv6-only net

Answer: E

Question No. 10

Which statement is FALSE concerning the interleave depth value?

Answer: D

Question No. 11

Which three attribute-value pairs (AVPs) must be present in L2TPv3 ICRQ messages? (Choose three.)

Answer: B, D, E

The ICRQ can include information such as pseudowire type, required Layer 2specific sublayer, and circuit status.

The following AVPs MUST be present in the ICRQ:

Message Type

Local Session ID

Remote Session ID

Serial Number

Pseudowire Type

Remote End ID

Circuit Status


Question No. 12

With VPLS, which protocol is used for label exchange and PW signalling?

Answer: E

Using a directed LDP session, each provider edge advertises a virtual circuit label mapping that is used as part of the label stack imposed on the Ethernet frames by the ingress provider edge during packet forwarding.

Question No. 13

A network engineer is trying to optimize convergence.

What action should be taken to overcome EBGP frequent session loss due to interface flapping between two different AS routers?

Answer: B

Question No. 14

Process-level redundancy is implemented by a system manager process that creates the standby process. What two functions are provided by the system-level process called Qnet Symlink Manager (QSM)? (Choose two.)

Answer: D, E

1.4. SP high end product

1.4.01. IOS-XR structure

Process-Level Redundancy

Process-level redundancy is implemented by a system manager process creating the standby process.

Because the active process created the standby process, the active process has all the information that it needs to communicate with the standby process. The active process uses a checkpoint database to share running state with the standby process. Symbolic links and abstract names are used to identify the processes.

Clients do not see the standby process until the active goes away. If a process fails and it has created a standby process, a system-level process called QNet Symlink Manager (QSM) and a library called Event Connection Manager (ECM) are used to re-establish links from the clients to the processes.

QSM provides:

Distribution of symbolic link information

Abstract name for a process or service

ECM provides:

Common information for connecting processes and services

Detection of broken connections

Only processes considered essential by development engineers are designated to support process-level redundancy. This is not a user-configurable option.

Clients have to reconnect to the “new” active process (the “original” standby process) when they detect that the active process has failed. Clients can connect to it using the symbolic links and abstract names. The new active process creates a new standby process.

The general steps in process redundancy are:

The active process dies.

The standby process becomes the active process.

A new standby process starts.

The new active process begins sending updates to the new standby process.

Clients begin using the new active process through the symbolic links and abstract names.

Question No. 15

Which IEEE task group provides a method to implement QoS on an Ethernet level?

Answer: B

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