[Free] Download New Latest (November) Cisco 400-201 Actual Tests 71-80

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QUESTION 71

What is the BGP synchronization rule?

 

A.

BGP should not advertise a route until that route has been learned via an IGP.

B.

Routing information received through an EBGP session is not forwarding to another EBGP neighbor, only to IBGP neighbors.

C.

BGP neighbor peering are established and synchronized using TCP.

D.

BGP should not advertise a route when that route has been learned via an IGP

E.

Routing information received through an IBGP session is not forwarding to another IBGP neighbor, only to EBGP neighbors.

 

Correct Answer: A

 

 

QUESTION 72

Which two statements about DS-Lite are true? (Choose two.)

 

A.

IPv4 packets are carried over IPv6 tunnels to the LSN while IPv6 traffic is forwarded natively.

B.

Ipv6 packets are carried over IPv4 tunnels to the LSN while IPv4 traffic is forwards natively.

C.

The LSN performs NAT44 on private IPv4 source addresses.

D.

DS-Lite does not perform any address translation.

 

Correct Answer: AC

Explanation:

Reference: “Understanding Dual-Stack Lite”

http://www.networkworld.com/community/node/46600

Dual-Stack Lite is a promising approach that takes the best of NAT464 while avoiding its problems:

It uses IPv6-only links between the provider and the customer, but does not use NAT64 translation. When a device in the customer network sends an IPv4 packet to an external destination, the IPv4 packet is encapsulated in an IPv6 packet for transport into the provider network. At the LSN, the packet is decapsulated and NAT44 isperformed.

 

 

QUESTION 73

Which four of these are MPLS label header fields? (Choose four.)

 

A.

Label

B.

VPI VCI

C.

EXP

D.

TTL

E.

FCS

F.

S flag

 

Correct Answer: ACDF

 

 

 

QUESTION 74

Which three modes are the operating of HDLC? (Choose three)

 

A.

asynchronous balanced mode (ABM)

B.

normal response mode (NRM)

C.< /span>

normal peer mode (NPM)

D.

asynchronous client mode (ACM)

E.

asynchronous response mode (ARM)

 

Correct Answer: ABE

Explanation:

Normal response mode allows operation over half-duplex communication links, as long as the primary is aware that it may not transmit when it has given permission to a secondary.

Asynchronous response mode is an HDLC addition[1] for use over full-duplex links. While retaining the primary/secondary distinction, it allows the secondary to transmit at any time. Asynchronous balanced mode added the concept of a combined terminal which can act as both a primary and a secondary. There are some subtleties about this mode of operation; while many features of the protocol do not care whether they are in a command or response frame, some do, and the address field of a received frame must be examined to determine whether it contains a command (the address received is ours) or a response (the address received is that of the other terminal).

 

 

QUESTION 75

Which two statements about the bgp deterministic-med and bgp always-compare-med commands are true? (Choose two)

 

A.

The bgp deterministic-med command is used to influence the BGP route selection process to cause the MED attribute to have higher precedence over the AS path length

B.

The bgp always-compare command is used to influence the BGP route selection process to cause the MED attribute to have higher precedence over the AS path system.

C.

Enabling the bgp deterministic-med command ensures the comparison of the MED variable when choosing routes advertised by different peers in the same autonomous system.

D.

Enabling the bgp always-compare-med command ensures the comparison of the MED variable for paths from neighbors in different autonomous systems.

E.

The bgp deterministic-med and bgp always-compare-med commands are enabled by defult.

 

Correct Answer: CD

Explanation:

Enabling the bgp deterministic-med command ensures the comparison of the MED variable when choosing routes advertised by different peers in the same autonomous system. Enabling the bgp always-compare-med command ensures the comparison of the MED for paths from neighbors in different autonomous systems.

Note: The bgp deterministic-med and bgp always-compare-med commands are not enabled by default. Also, the two commands are separate; enabling one does not automatically enable the other.

 

 

QUESTION 76

Which two statements about MPLS point-to-multipoint traffic engineering (P2MP TE) are true? (Choose two)

 

A.

P2MP TE uses an OSPF extension that is different from the OSPF extension that is used in P2P TE.

B.

Loose path is not supported in P2MP TE.

C.

Multiple IP multicast groups can map to one P2MP tunnel.

D.

Affinity is not supported in P2MP TE.

E.

P2MP TE uses Constrained Shortest Path First (CSPF) to calculate paths.

 

Correct Answer: CE

 

 

QUESTION 77

Which statement about Remotely Triggered Black Hole (RTBH) is true?

 

A.

Route tagging is one of the techniques used by RTBH

B.

It is used for BGP authentication

C.

It cannot work with static routes

D.

It uses extended ACLs for blocking attacks by creating a black hole

E.

Before configuring RTBH. LDP must be enabled on the interface

 

Correct Answer: A

 

 

QUESTION 78

Forwarding Equivalence Class (FEC) corresponds to which four of these? (Choose four).

 

A.

Layer 2 circuits (ATM, FR, PPP, HDLC, Ethernet

B.

Groups of addresses/sites-VPN

C.

IPSEC Encryption Algorithm

D.

A bridge/switch instance-VSI

E.

Tunnel interface-traffic engineering

 

Correct Answer: ABDE

 

 

QUESTION 79

Which BGP community is used to prevent the advertisement of the BGP prefix to other BGP peers?

 

A.

no-advertise

B.

additive

C.

no-export

D.

local-as

E.

none

 

Correct Answer: A

 

 

QUESTION 80

What type of IPv6 address is this address FF05::2:260:8FF:FE52:F9D8?

 

A.

multicast temporary node local

B.

multicast temporary site local

C.

unicast permanent link local

D.

multicast permanent node link local

E.

multicast permanent site local

F.

unicast temporary link local

 

Correct Answer: E

Explanation:

Permanent IPv6 Multicast addresses are assigned by IANA while the temporary IPv6 Multicast addresses can be used in pre-deployment Multicast testing. The Flag field may contain one of two possible values, as illustrated and described in the Table below:

 

Type of Multicast Address Binary Representation Hexadecimal Value

Permanent 0000 0

Temporary 0001 1

Multicast scope

The scope field indicates the scope of the IPv6 internetwork for which the multicast traffic is intended. The size of this field is 4 bits. In addition to information provided by multicast routing protocols, routers use multicast scope to determine whether multicast traffic can be forwarded. For multicast addresses there are 14 possible scopes (some are still unassigned), ranging from interface-local to global (including both link-local and sitelocal). The following table lists the defined values for the scope field:

Table 3. Multicast scope field values

Value Scope

0 Reserved

1 Interface-local scope (same node)

2 Link-local scope (same link)

3 Subnet-local scope

4 Admin-local scope

5 Site-local scope (same site)

8 Organization-local scope

E Global scope

F Reserved

All other scope field values are currently undefined.

For example, traffic with the multicast address of FF02::2 has a link-local scope. An IPv6 router never forwards this type of traffic beyond the local link.

 

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