Cisco 400-201 Practice Exam Questions

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Question No. 1

Which three of these are optical channel data unit (ODU) overhead fields? (Choose three)

Answer: C, D, E

Optical Data Unit (ODU)

The ODU overhead is broken into several fields: RES, PM, TCMi, TCM ACT, FTFL, EXP, GCC1/GCC2 and APS/PCC. The reserved (RES) bytes are undefined and are set aside for future applications.

The path monitoring (PM) field is similar to the SM field described above. It contains the TTI, BIP-8, BEI, BDI and Status (STAT) sub-fields.

There are six tandem connection monitoring (TCMi) fields that define the ODU TCM sub-layer, each containing TTI, BIP-8, BEI/BIAE, BDI and STAT sub-fields associated to each TCM level (i=1 to 6). The STAT sub-field is used in the PM and TCMi fields to provide an indication of the presence or absence of maintenance signals.

The tandem connection monitoring activation/deactivation (TCM ACT) field is currently undefined in the standards. The fault type and fault location reporting communication channel (FTFL) field is used to create a message spread over a 256-byte multiframe. It provides the ability to send forward and backward path-level fault indications.

The experimental (EXP) field is a field that is not subject to standards and is available for network operator applications.

General communication channels 1 and 2 (GCC1/GCC2) fields are very similar to the GCC0 field except that each channel is available in the ODU.

The automatic protection switching and protection communication channel (APS/PCC) supports up to eight levels of nested APS/PCC signals, which are associated to a dedicated-connection monitoring level depending on the value of the multiframe.

Question No. 2

Refer to the exhibit.

A client is unable to receive traffic from multicast streamer (R5) on 234.1.1.1, even though multicast routing is established in the network.

Which statement describes how to resolve this issue?

Answer: D

Question No. 3

ISP_X is IPv4 only in the core with MPLS enabled in the backbone. ISP_X must provide IPv6 services to its customers including IPv6 Internet access. Which IPv6 transition mechanism allows ISP_X to provide IPv6 connection by levering the existing MPLS core network?

Answer: C

Question No. 4

Refer to the exhibit.

Each AS domain contains more than one BGP router. Site-B sends traffic to ISP-1 over a directly connected link, but Site-B is not used as an AS transit for the ISP-1 backbone. How should the routes be advertised by ISP-1 towards Site-B to accomplish this task?

Answer: B

Question No. 5

In a PE-CE scenario using OSPF as the routing protocol a down-bit set can be advertised in which OSPF LSA type?

Answer: C

Question No. 6

Select 3 AVPs (Attribute-Value Pair) which MUST be present in the ICRQ:

Answer: B, C, E

Question No. 7

Which Cisco IOS XR security component can protect the route processor of the Cisco CRS router?

Answer: C

Question No. 8

What is the default maximum transmission unit on the Cisco router ATM interface?

Answer: A

Why are MTUs 4470 Bytes?

Most Cisco ATM router interfaces use a default MTU size of 4470 bytes. This number was chosen to match exactly Fiber Distributed Data Interface (FDDI) and High-Speed Serial Interface (HSSI) interfaces for autonomous switching.

Question No. 9

A customer is connected to a service provider by a low-speed link and wants to increase the bandwidth of this connectivity without creating additional IP addresses. Multiple physical links with the same bandwidth value are already available between the customer and the service provider. Which technology can be used to achieve these requirements?

Answer: C

Question No. 10

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

Answer: C, D, E

*Default-MDT

Tree created by the MVPN configuration. The Default-MDT is used for customer Control Plane and low rate Data Plane traffic. It connects all of the PE routers with MVRFs in a particular MD and one will exist in every MD whether there is any active source in the respective customer network.

Question No. 11

A service provider must avoid packet loss when an IGP adjacency is established before the LDP label exchange completes between the peers on that link. Which feature must be implemented that fulfills this requirement?

Answer: C

Question No. 12

In which way does the DS-Lite IPv6 transitioning mechanism differ from IPv6 Dual-Stack?

Answer: A

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

In the Internet of things architecture, which two options are considered nodes in Low-power Lossy networks? (Choose two)

Answer: A

Question No. 15

Refer to the exhibit.

An ISP engineer has been asked to identity a method to protect the PE and to control the number of BGP prefixes learned from his customers. The BGP session should be dropped if the PE router receives more than 1000 BGP prefixes. A syslog message should be generated when the number of BGP prefixes learned from CE exceeds 850.

Which Cisco IOS command should the engineer apply on PE routers?

Answer: A

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