[Free] 2017(July) Ensurepass Braindumps Cisco 400-101 Latest Dumps 101-110

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CCIE Routing and Switching Written Exam v5.1

QUESTION 101

Which statement about the BGP originator ID is true?

 

A.

The route reflector always sets the originator ID to its own router ID.

B.

The route reflector sets the originator ID to the router ID of the route reflector client that injects the route into the AS.

C.

The route reflector client that injects the route into the AS sets the originator ID to its own router ID.

D.

The originator ID is set to match the cluster ID.

 

Correct Answer: B

Explanation:

An RR reflecting the route received from a RR-Client add
s:

Originator ID – a 4-byte BGP attribute that is created by the RR. This attribute carries the Router ID of the originator of the route in the local AS. If the update comes back to the originator, it ignores the update.

Cluster List – A Cluster List is a list of Cluster IDs that an update has traversed. When a route reflector sends a route received from a client to a non-client, it appends the local Cluster ID. If a route reflector receives a route whose Cluster List contains the local Cluster ID, it ignores the update.

 

Reference: https://sites.google.com/site/amitsciscozone/home/bgp/bgp-route-reflectors

 

 

QUESTION 102

Refer to the exhibit. Which statement is true?

 

clip_image001

 

A.

R1 routes this pseudowire over MPLS TE tunnel 1 with transport label 20.

B.

The default route 0.0.0.0/0 is available in the IPv4 routing table.

C.

R1 is using an MPLS TE tunnel for this pseudowire, because the IP path is not available .

D.

R1 has preferred-path configured for the pseudowire.

 

Correct Answer: D

Explanation:

Verifying the Configuration:

Example:

In the following example, the show mpls l2transport vc command shows the following information (in bold) about the VCs:

 

VC 101 has been assigned a preferred path called Tunnel1. The default path is disabled because

VC 150 has been assigned an IP address of a loopback address on PE2. The default path can be used if the preferred path fails.

 

Router# show mpls l2transport vc detail

 

Local interface. Gi0/0/0.1 up, line protocol up, Eth VLAN 222 up

Destination address: 10.16.16.16, VC ID. 101, VC status: up

Preferred path: Tunnel1, active

Default path: disabled

Tunnel label: 3, next hop point2point

Output interface. Tu1, imposed label stack {17 16}

Create time. 00:27:31, last status change time. 00:27:31

Signaling protocol: LDP, peer 10.16.16.16:0 up

MPLS VC labels: local 25, remote 16

Group ID. local 0, remote 6

MTU: local 1500, remote 1500

Remote interface description:

Sequencing: receive disabled, send disabled

VC statistics:

packet totals: receive 10, send 10

byte totals: receive 1260, send 1300

packet drops: receive 0, send 0

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srtunsel.html#wp1057815

 

 

QUESTION 103

DRAG DROP

clip_image003

 

Correct Answer:

clip_image005

 

 

QUESTION 104

What are the minimal configuration steps that are required to configure EIGRP HMAC- SHA2 authentication?

 

A.

classic router mode, interface XX, authentication mode hmac-sha-256 <password>

B.

named router mode, address-family statement, authentication mode hmac-sha-256 <password>

C.

named router mode, address-family statement, af-interface default, authentication mode hmac-sha-256 <password>

D.

named router mode, address-family statement, authentication mode hmac-sha-256 <password>

 

Correct Answer: C

Explanation:

The example below shows how to configure EIGRP HMAC-SHA2 on Cisco router:

Device(config)# router eigrp name1

Device(config-router)# address-family ipv4 autonomous-system 45000

Device(config-router-af)# af-interface ethernet 0/0

Device(config-router-af-interface)# authentication mode hmac-sha-256 0 password1

Device(config-router-af-interface)# end

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-sy/ire-15-sy-book/ire-sha-256.html

 

 

QUESTION 105

Which statement about the function of poison reverse in EIGRP is true?

 

A.

It tells peers to remove paths that previously might have pointed to this router.

B.

It tells peers to remove paths to save memory and bandwidth.

C.

It provides reverse path information for multicast routing.

D.

It tells peers that a prefix is no longer reachable.

 

Correct Answer: A

Explanation:

Poison Reverse in EIGRP states: “Once you learn of a route through an interface, advertise it as unreachable back through that same interface”. For more information please read here.

http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/16406-eigrp-toc.html#splithorizon.

 

 

QUESTION 106

Which technology is an application of MSDP, and provides load balancing and redundancy between the RPs?

 

A.

static RP

B.

PIM BSR

C.

auto RP

D.

anycast RP

 

Correct Answer: D

Explanation:

Using Anycast RP is an implementation strategy that provides load sharing and redundancy in Protocol Independent Multicast sparse mode (PIM-SM) networks. Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup routers for each other. Multicast Source Discovery Protocol (MSDP) is the key protocol that makes Anycast RP possible.

Reference: www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.html

 

 

QUESTION 107

Which two statements are true about an EVPL? (Choose two.)

 

A.

It has a high degree of transparency.

B.

It does not allow for service multiplexing.

C.

The EVPL service is also referred to as E-line.

D.

It is a point-to-point Ethernet connection between a pair of UNIs.

 

Correct Answer: CD

Explanation:

Following the MEF approach, the services that comprise the Metro Ethernet (ME) solution can be classified into the following two general categories:

Point-to-point (PtP)–A single point-to-point Ethernet circuit provisioned between two User Network Interfaces (UNIs).

Multipoint-to-multipoint (MPtMP)–A single multipoint-to-multipoint Ethernet circuit provisioned between two or more UNIs. When there are only two UNIs in the circuit, more UNIs can be added to the same Ethernet virtual connection if required, which distinguishes this from the point-to-point type.

In the MEF terminology, this maps to the following Ethernet service types:

Ethernet Line Service Type (E-Line)–Point-to-point Ethernet service

Ethernet LAN Service Type (E-LAN)–Multipoint-to-multipoint Ethernet service

Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_Clusters/ HA_ME3_6.pdf

 

 

QUESTION 108

Which statement describes the purpose of the Payload Type field in the RTP header?

 

A.

It identifies the signaling protocol.

B.

It identifies the codec.

C.

It identifies the port numbers for RTP.

D.

It identifies the port numbers for RTCP.

 

Correct Answer: B

Explanation:

PT, Payload Type. 7 bits: Identifies the format of the RTP payload and determines its interpretation by the application. A profile specifies a default static mapping of payload type codes to payload formats. Additional payload type codes may be defined dynamically through non-RTP means. An RTP sender emits a single RTP payload type at any given time; this field is not intended for multiplexing separate media streams. A full list of codecs and their payload type values can be found at the link below:

Reference: http://www.networksorcery.com/enp/protocol/rtp.htm

 

 


QUESTION 109

Which three condition types can be monitored by crypto conditional debug? (Choose three.)

 

A.

Peer hostname

B.

SSL

C.

ISAKMP

D.

Flow ID

E.

IPsec

F.

Connection ID

 

Correct Answer: ADF

Explanation:

Supported Condition Types

The new crypto conditional debug CLIs–debug crypto condition, debug crypto condition unmatched, and show crypto debug-condition–allow you to specify conditions (filter values) in which to generate and display debug messages related only to the specified conditions. The table below lists the supported condition types.

Table 1 Supported Condition Types for Crypto Debug CLI Condition Type (Keyword)

Description

connid 1

An integer between 1-32766. Relevant debug messages will be shown if the current IPSec operation uses this value as the connection ID to interface with the crypto engine.

flowid 1

An integer between 1-32766. Relevant debug messages will be shown if the current IPSec operation uses this value as the flow-ID to interface with the crypto engine.

FVRF

The name string of a virtual private network (VPN) routing and forwarding (VRF) instance. Relevant debug messages will be shown if the current IPSec operation uses this VRF instance as its front-door VRF (FVRF).

IVRF

The name string of a VRF instance. Relevant debug messages will be shown if the current IPSec operation uses this VRF instance as its inside VRF (IVRF).

peer group

A Unity group-name string. Relevant debug messages will be shown if the peer is using this group name as its identity.

peer hostname

A fully qualified domain name (FQDN) string. Relevant debug messages will be shown if the peer is using this string as its identity; for example, if the peer is enabling IKE Xauth with this FQDN string.

peeripaddress

A single IP address. Relevant debug messages will be shown if the current IPSec operation is related to the IP address of this peer.

peer subnet

A subnet and a subnet mask that specify a range of peer IP addresses. Relevant debug messages will be shown if the IP address of the current IPSec peer falls into the specified subnet range.

peer username

A username string. Relevant debug messages will be shown if the peer is using this username as its identity; for example, if the peer is enabling IKE Extended Authentication (Xauth) with this username.

SPI 1

A 32-bit unsigned integer. Relevant debug messages will be shown if the current IPSec operation uses this value as the SPI.

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_vpnips/configuration/xe-3s/sec-sec-for-vpns-w-ipsec-xe-3s-book/sec-crypto-debug-sup.html

 

 

QUESTION 110

Refer to the exhibit. Which two statements are true? (Choose two.)

 

clip_image007

A.

This router is not 4-byte autonomous system aware.

B.

This router is 4-byte autonomous system aware.

C.

The prefix 10.100.1.1/32 was learned through an autonomous system number with a length of 4 bytes, and this router is 4-byte autonomous system aware.

D.

The prefix 10.100.1.1/32 was learned through an autonomous system number with a length of 4 bytes, and this router is not 4-byte autonomous system aware.

E.

The prefix 10.100.1.1/32 was originated from a 4-byte autonomous system.

 

Correct Answer: AD

Explanation:

Prior to January 2009, BGP autonomous system (AS) numbers that were allocated to companies were 2-octet numbers in the range from 1 to 65535 as described in RFC 4271, A Border Gateway Protocol 4 (BGP-4). Due to increased demand for AS numbers, the Internet Assigned Number Authority (IANA) started to allocate four-octet AS numbers in the range from 65536 to 4294967295. RFC 5396, Textual Representation of Autonomous System (AS) Numbers, documents three methods of representing AS numbers. Cisco has implemented the following two methods:

Asplain – Decimal value notation where both 2-byte and 4-byte AS numbers are represented by their decimal value. For example, 65526 is a 2-byte AS number and 234567 is a 4-byte AS number.

Asdot – Autonomous system dot notation where 2-byte AS numbers are represented by their decimal value and 4-byte AS numbers are represented by a dot notation. For example, 65526 is a 2-byte AS number and 1.169031 is a 4-byte AS number (this is dot notation for the 234567 decimal number).

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-4byte-asn.html

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