Download New Updated (Spring 2015) Cisco 350-029 Actual Tests 241-250

By | April 26, 2015

Ensurepass

 

QUESTION 241

In AToM, control word is an optional 4-byte field used in the pseudowire packet. The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly. In pseudowire packet, where is this control word inserted?

 

A.

Inserted between the MPLS label stack and the Layer 3 payload

B.

Inserted between the MPLS label stack and the Layer 3 Header

C.

Inserted between the MPLS labelstack and the Layer 2 payload

D.

Inserted between the MPLS label stack and the Layer 2 header

 

Correct Answer: D

 

 

QUESTION 242

In the case of Ethernet transport, which two types of attachment circuits does L2TPv3 support? (Choose two.)

 

A.

port tunneling onthe Ethernet subinterface

B.

VLAN tunneling on the Ethernet trunk

C.

port tunneling on the Ethernet interface

D.

VLAN tunneling on the Ethernet VLAN subinterface

E.

port tunneling on the Ethernet trunk

 

Correct Answer: CD

Explanation:

L2TPv3 can be configured on either a physical port or on a subinterface. The first is known as Port tunneling and the second as vlan tunneling.

 

 

QUESTION 243

Packed Cell Relay encapsulation with AToM includes which of the following? (Choose four.)

 

< /tr>

A.

Tunnel label

B.

VC-label

C.

5-byte ATMheader

D.

Payload

E.

4 byte ATM header

F.

Support for 30 packed cells.

 

Correct Answer: ABDE

Explanation:

Packed cell relay (cell packing). This allows the encapsulation of multiple ATM cells in each AToM data channel packet.

 

 

QUESTION 244

Which three configurationoptions are available for configuring the l2tp-class command in L2TPv3? (Choose three)

 

A.

TCP port

B.

authentication

C.

IP DF bit

D.

retransmit retries

E.

sequencing

F.

hostname

 

Correct Answer: BDF

Explanation:

On Cisco 7200, l2tp-class options available are:

 

R1(config-l2tp-class)#?

l2tp-class configuration commands:

accounting Method list to use for tunnel accounting authentication Authenticate the L2TP control connection cookie Local cookie options default Set a command to its defaults digest Message Digest Authentication for the L2TP control connection exit Exit from l2tp-class configuration mode hello Set HELLO message interval hidden Hide AVPs in outgoing control messages hostname Local hostname for control connection authentication no Negate a command or set its defaults password Password for control connection authentication, AVP hiding receive-window Receive window size for the control connection retransmit Control message retransmission parameters timeout Control connection timeout parameters

 

R1(config-l2tp-class)#retransmit ?

initial SCCRQ message retries/timeout settings

retries Number of retries before tearing down a control connection timeout Control packet retransmission timeout parameters

 

R1#sh run | be l2tp-class

l2tp-class test

authentication

hostnameTESTNODE

retransmit retries 5

 

 

QUESTION 245

Which statement about L2VPN Pseudowire Switching is not true?

 

A.

L2VPN Pseudowire Switching allows the user to extend L2VPN Pseudowires across an inter-AS boundary.

B.

L2VPN Pseudowire Switching allows theuser to extend L2VPN Pseudowires across two separate MPLS networks.

C.

Quality of service is not supported per Pseudowire.

D.

L2VPN Pseudowire Switching connects two or more contiguous Pseudowires segments to from an end-toend multihop Pseudowire.

E.

The Cisco MPLS Traffic Engineering tunnel selection is not supported.

 

Correct Answer: E

Explanation:

Reference

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fsstitch.html#wp1053770

 

 

QUESTION 246

Which three statements about L2TPv3 are true? (Choose three)

 

A.

L2TPv3 Frame Relay support includes only 32-bit DLCI addressing.

B.

L2TPv3 sessions do not support Frame Relay LMI interworking.

C.

Multipoint DLCI is not supported.

D.

To use DCE or a Network-to-Network Interface on a Frame Relay port, you must configure the frame-relayswitching command.

E.

L2TPv3 feature does not support Frame Relay extended addressing.

 

Correct Answer: CDE

Explanation:

Frame Relay-Specific Restrictions

Frame Relayper-DLCI forwarding and port-to-port trunking are mutually exclusive. L2TPv3 does not support the use of both on the same interface at the same time.

The xconnect command is not supported on Frame Relay interfaces directly. For Frame Relay, the Xconnect is applied under the connect command specifying the DLCI to be used.

Changing the encapsulation type on any interface removes any existing xconnect command applied to that interface.

To use DCE or a Network-to-Network Interface (NNI) on a Frame Relay port, you must configure the framerelay switching command.

The configuration of an L2TPv3 session on a Multilink Frame Relay (MLFR) bundle interface is supported only on Cisco 12000 series Two-Port Channelized OC-3/STM-1 (DS1/E1) and Six-Port Channelized T3 (T1) line cards. (For more information, see Binding L2TPv3 Sessions to Multilink Frame Relay Interfaces.)

Frame Relay policing is nondistributed on the Cisco 7500 series. By configuring Frame Relay policing, you cause tr
affic on the affected PVCs to be sent to the RSP for processing.
rame Relay support is for 10-bit DLCI addresses. Frame Relay Extended Addressing is not supported.

Multipoint DLCI is not supported.

The keepalive will automatically be disabled on interfaces that have an Xconnect applied to them, except for Frame Relay encapsulation, which is a requirement for LMI.

Static L2TPv3 sessions will not support Frame Relay LMI interworking.

 

 

QUESTION 247

Which two statements best describe the signalling requirements of virtual circuit setup of VPLS and exchange of reachability information (MAC addresses)?

 

A.

Cisco VPLS does not require the exchange of reachability (MAC addresses) information via a signaling protocol. This information is learned from the data plane using standard address learning, aging, and filtering mechanisms defined for Ethernet bridging.

B.

Cisco VPLS uses directed LDP as a signalling protocol to exchange reachability (MACaddresses) information to avoid maintanance of ARP cache.

C.

In Cisco VPLS the virtual circuit setupuses Multi-Protocol BGP as autodiscovery and signaling mechanism. Using BGP allows BPDUs to be propagated across VPLS in a scaleable fashion.

D.

In Cisco VPLS the virtual circuit setup uses the same LDP signaling mechanism defined for point-to-point services. Using a directed LDP session, each provider edge advertises a virtual circuit label mapping that is used as part of the label stack imposed on the Ethernet frames by the ingress provider edge during packet forwarding.

 

Correct Answer: AD

 

 

QUESTION 248

When an MPLS Layer 2 VPN runs in the hub-and-spoke model, where is QoS implemented?

 

A.

hub and spoke

B.

PE

C.

CE

D.

hub

E.

spoke

 

Correct Answer: D

 

 

QUESTION 249

When you design QoS on CE for an MPLS Layer 2 VPN, which three things should be considered? (Choose three.)

 

A.

Layer 2 access link QoS design

B.

enterprise-to-service-provider mapping models

C.

Layer 3 link access QoS design

D.

service provider service level agreements

E.

Layer 2 link access load balancing

 

Correct Answer: ABD

 

 

QUESTION 250

Which two Any Transport over MPLS (AToM) traffic encapsulations require the use of a control word? (Choose two)

 

A.

HDLC

B.

ATM AAL5

C.

PPP

D.

Ethernet VLAN

E.

Frame Relay

 

Correct Answer: BE

Explanation:

AToM Header

The AToM header is 4 bytes (control word). The control word isoptional for Ethernet, PPP, HDLC, and cell relay transport types. However, the control word is required for Frame Relay, and ATM AAL5 transport types.

 

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