Cisco 400-201 Exam PDF Study Guide

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Question No. 1

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. 2

In PPPoA architecture, which two methods are most commonly deployed? (Choose two)

Answer: A, E

In PPPoA architectures, the service destination can be reached in different ways. Some of the most commonly deployed methods are:

Terminating PPP sessions at the service provider

L2TP Tunneling

Using SSG

Question No. 3

In optical channel transport unit overhead (OTU OH), what are general communication channels 1 and 2 (GCC1/GCC2) used for?

Answer: E

OTU overhead:

The OTU overhead consists of three bytes for section monitoring (SM), a two-byte general communications channel (GCC0), and two bytes reserved for future international standardization.

Question No. 4

A service provider has a requirement to prevent and prevent spoofing attacks by verifying the reachability of the sources address in a packet that is forwarded into its network. Which method must be the service provider use?

Answer: C

Question No. 5

A service provider is implementing an nV Edge system with the two ASR 9000 chassis has two RSPs. Which two cabling methods reflect the minimum configuration needed for full synchronization between the two Cisco ASR 9000 chassis? (Choose two)

Answer: A, E

Question No. 6

Refer to the exhibit.

Refer to the exhibit. Router A is not receiving any label information from Router B. Which two different solutions could fix this issues? (Choose two)

Answer: D, F

Question No. 7

During the modem boot process, how does the modem acquire the downstream channel?

Answer: D

Question No. 8

A network engineer is requested to have load sharing over two links to the same destination prefix. The traffic share for the first link must be two times the traffic share of the second link. Which two protocols can fulfill this requirement? (Choose two.)

Answer: A, B

Question No. 9

What is the port number of the IPsec Authentication Header packet?

Answer: D

6.2. Managed Security services traversing the core

AH operates directly on top of IP, using IP protocol number 51.

ESP operates directly on top of IP, using IP protocol number 50.

Question No. 10

What are two uRPF working modes? (Choose two.)

Answer: C, D

Question No. 11

An support engineer has been tasked to protect an ISP infrastructure from the growing number of encrypted DDoS attacks. The solution should also validate the eBGP peering. Which solution accomplishes these goals?

Answer: E

Question No. 12

Where is the MPLS label imposed?

Answer: E

Question No. 13

Which OSPFv3 LSA is never Flooded beyond the link?

Answer: C

Question No. 14

In the context of GMPLS, LMP stands for:

Answer: D

The Generalized Multi-Protocol Label Switching (GMPLS)[1] is a protocol suite extending MPLS to manage further classes of interfaces and switching technologies other than packet interfaces and switching, such as time division multiplex, layer-2 switch, wavelength switch and fiber-switch.

GMPLS is composed of three main protocols:

Resource Reservation Protocol with Traffic Engineering extensions (RSVP-TE) signaling protocol.[5][6]Open Shortest Path First with Traffic Engineering extensions (OSPF-TE) routing protocol.[7][8] Link Management Protocol (LMP).[9]

Question No. 15

A customer wants the minimum delay for the transit traffic that traverses the service provider core. An engineer realizes that the customer sites are remotely dispersed and wants to give them a specific path through the MPLS core with guaranteed bandwidth and without relying on the shortest path of OSPF as the customer IGP. Which technology will achieve the required result?

Answer: C

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