[Free] 2017(July) Ensurepass Braindumps Cisco 400-101 Latest Dumps 381-390

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CCIE Routing and Switching Written Exam v5.1

QUESTION 381

Which option describes the purpose of the PPP endpoint discriminator?

 

A.

It identifies the maximum payload packet.

B.

It notifies the peer that it prefers 12-bit sequence numbers.

C.

It identifies the system attached to the link.

D.

It determines whether a loopback is on the link.

 

Correct Answer: C

Explanation:

In situations in which many clients use the same username to initiate an MP connection, or when interoperating with non-Cisco routers, you need to control the order in which the bundle name is c
reated. It is necessary to configure the access server to create a bundle name based on the endpoint discriminator first, the username second, or both. The endpoint discriminator identifies the system transmitting the packet and advises the network access server (NAS) that the peer on this link could be the same as the peer on another existing link. Because every client has a unique endpoint discriminator, only multiple links from the same client are bundled into a single unique MP connection. For example, consider when two PC clients initiate a multilink connection to an access server using the same username. If the multilink bundle name is established based on the endpoint discriminator first, then on the username or on both, the NAS can accurately bundle the links from each client using the endpoint discriminator as a bundle name. This bundle name is unique to the peer system transmitting the packet.

Reference: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10238-mppp-bundle-name.html

 

QUESTION 382

DRAG DROP

clip_image002

 

Correct Answer:

clip_image004

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 383

Refer to the exhibit. Which technology can be used on the switch to enable host A to receive multicast packets for 239.2.2.2 but prevent host B from receiving them?

 

clip_image005

 

A.

IGMP filtering

B.

MLD snooping

C.

IGMP snooping

D.

MLD filtering

 

Correct Answer: C

Explanation:

IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic. The feature allows a network switch to listen in on the IGMP conversation between hosts and routers. By listening to these conversations the switch maintains a map of which links need which IP multicast streams. Multicasts may be filtered from the links which do not need them and thus controls which ports receive specific multicast traffic.

 

 

QUESTION 384

DRAG DROP

clip_image007

 

Correct Answer:

clip_image009

 

 

QUESTION 385

What is the main component of Unified MPLS?

 

A.

Multiple IGPs in the network are used, where the loopback IP addresses of the PE routers are aggregated on the area border routers.

B.

Confederations are used to provide scalability.

C.

The loopback prefixes from one IGP area are redistributed into BGP without changing the next hop.

D.

The ABR is a BGP route reflector and sets next-hop to self for all reflected routes.

 

Correct Answer: D

Explanation:

Since the core and aggregation parts of the network are integrated and end-to-end LSPs are provided, the Unified MPLS solution is also referred to as “Seamless MPLS.” New technologies or protocols are not used here, only MPLS, Label Distribution Protocol (LDP), IGP, and BGP. Since you do not want to distribute the loopback prefixes of the PE routers from one part of the network into another part, you need to carry the prefixes in BGP. The Internal Border Gateway Protocol (iBGP) is used in one network, so the next hop address of the prefixes is the loopback prefixes of the PE routers, which is not known by the IGP in the other parts of the network. This means that the next hop address cannot be used to recurse to an IGP prefix. The trick is to make the ABR routers Route Reflectors (RR) and set the next hop to self, even for the reflected iBGP prefixes. In order for this to work, a new knob is needed.

Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116127-configure-technology-00.html

 

 

QUESTION 386

Which three statements about IS-IS are true? (Choose three.)

 

A.

IS-IS is not encapsulated in IP.

B.

IS-IS is directly encapsulated in the data link layer.

C.

0XFEFE is used in the Layer 2 header to identify the Layer 3 protocol.

D.

IS-IS uses protocol ID 93.

E.

IS-IS can be used to route the IPX protocol.

F.

IS-IS is an IETF standard.

 

Correct Answer: ABC

Explanation:

IS-IS is an Interior Gateway Protocol (IGP) for routing OSI. IS-IS packets are not encapsulated in CLNS or IP but are encapsulated directly in the data-link layer. The IS-IS protocol family is OSI, and values such as 0xFE and 0xFEFE are used by the data-link protocol to identify the Layer 3 protocol as OSI.

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml

 

 

QUESTION 387

Refer to the exhibit. Which statement is true?

 

clip_image010

 

A.

R2 is directly connected to the receiver for this group and is the winner of an assert mechanism.

B.

R2 is directly connected to the receiver for this group, and it forwards the traffic onto Ethernet3/0, but it is forwarding duplicate traffic onto Ethernet3/0.

C.

R2 has the A flag (Accept flag) set on Ethernet 3/0. This is fine, since the group is in BIDIR PIM mode.

D.

R2 is directly connected to the receiver for this group and is the loser of an assert mechanism.

E.

The A flag is set until the SPT threshold is reached for this multicast group.

 

Correct Answer: A

Explanation:

show ip mroute Field Descriptions

Field

Description

 

RPF neighbor or RPF nbr

IP address of the upstream router to the source. Tunneling indicates that this router is sending data to the RP encapsulated in register packets. The hexadecimal number in parentheses indicates to which RP it is registering. Each bit indicates a different RP if multiple RPs per group are used. If an asterisk (*) appears after the IP address in this field, the RPF neighbor has been learned through an assert.

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult3.html

 

 

QUESTION 388

Which two packet types does an RTP session consist of? (Choose two.)

 

A.

TCP

B.

RTCP

C.

RTP

D.

ICMP

E.

BOOTP

F.

ARP

 

Correct Answer: BC

Explanation:

An RTP session is established for each multimedia stream. A session consists of an IP address with a pair of ports for RTP and RTCP. For example, audio and video streams use separate RTP sessions, enabling a receiver to deselect a particular stream. The ports which form a session are negotiated using other protocols such as RTSP (using SDP in the setup method) and SIP. According to the specification, an RTP port should be even and the RTCP port is the next higher odd port number.

Reference: http://en.wikipedia.org/wiki/Real-time_Transport_Protocol

 

 

QUESTION 389

External EIGRP route exchange on routers R1 and R2 was failing because the routers had duplicate router IDs. You changed the eigrp router-id command on R1, but the problem persists. Which additional action must you take to enable the routers to exchange routes?

 

A.

Change the corresponding loopback address.

B.

Change the router ID on R2.

C.

Reset the EIGRP neighbor relationship.

D.

Clear the EIGRP process.

 

Correct Answer: D

 

 

QUESTION 390

Which two statements best describe the difference between active mode monitoring and passive mode monitoring? (Choose two.)

 

A.

Passive mode monitoring uses IP SLA to generate probes for the purpose of obtaining information regarding the characteristics of the WAN links.

B.

Active mode monitoring is the act of Cisco PfR gathering information on user packets assembled into flows by NetfFow.

C.

Active mode monitoring uses IP SLA probes for obtaining performance characteristics of the current exit WAN link.

D.

Passive mode monitoring uses NetFlow for obtaining performance characteristics of the exit WAN links.

 

Correct Answer: CD

Explanation:

Passive and Active Monitoring

Passive monitoring is the act of OER gathering information on user packets assembled into flows by NetFlow. OER, when enabled, automatically enables NetFlow on the managed interfaces on the border routers. By aggregating this information on the border routers and periodically reporting the collected data to the master controller, the network prefixes and applications in use can automatically be learned. Additionally, attributes like throughput, reachability, loading, packet loss, and latency can be deduced from the collected flows.

Active monitoring is the act of generating IP SLA probes to generate test traffic for the purpose of obtaining information regarding the characteristics of the WAN links. Active probes can either be implicitly generated by OER when passive monitoring has identified destination hosts, or explicitly configured by the network manager in the OER configuration.

Reference:

http://products.mcisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/Transport_diversity/Transport_Diversity_PfR.html#wp199209

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