Cisco CCIE Service Provider Written Set 5

1.

What is the data encapsulation method for the VPLS virtual circuit (VC)?

MAC over MPLS L2TPV3 802.1 QinQ Ethernet over MPLS GRE

2.

With VPLS, which protocol is used for label exchange and PW signalling?

MP-BGP LDP BGP MTP Directed LDP

3.

Which two statements are correct?

A VC type 5 transports a VLAN over MPLS. A VC type 4 tunnels an Ethernet port over MPLS. A VC type 5 tunnels an Ethernet port over MPLS. A VC type 4 transports a VLAN over MPLS.

4.

Which statement about VPLS is true?

All CE devices emulate a bridge All provider devices emulate a bridge Hierarchical VPLS reduces signaling overhead Each PE device emulates a bridge Each CE device emulates a bridge

5.

According to RFC 3931, L2TPv3 utilizes the IANA assigned IP protocol ID of:

115 101 121 51 151

6.

Which two options best describe the purpose of session ID and cookie field in a L2TPv3 packet?

The session ID is a 32-bit locally significant field used to identify the call on the destination or egress tunnel endport. The session ID will be negotiated by the control connection or statically defined if using the L2TP v3 data plane only. The cookie is a variable length (with a maximum of eight bytes),word-aligned optional field. The control connection can negotiate this as an additional level ofguarantee beyond the regular session ID lookup to make sure that a data message has been directed to the correct session or that any recently reused session ID will not be misdirected. The cookie is a 32-bit locally significant field used to identify the call on the destination or egress tunnel endpoint. The cookie will be negotiated by the controlconnection or statically defined if using the L2TPv3 data plane only The session ID is a variable length (with a maximum of eight bytes), word-aligned optional field.The control connection can negotiate this as an additional levelof guarantee beyond the regular cookie lookup to make sure that a data message has been directed to the correct session or that any recently reused cookie will not be misdirected.

7.

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?

Inserted between the MPLS label stack and the Layer 3 payload Inserted between the MPLS label stack and the Layer 3 Header Inserted between the MPLS label stack and the Layer 2 payload Inserted between the MPLS label stack and the Layer 2 header

8.

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

Tunnel label VC-label 5-byte ATM header Payload 4 byte ATM header

9.

Which statement about L2VPN Pseudowire Switching is not true?

L2VPN Pseudowire Switching allows the user to extend L2VPN Pseudowires across an inter- AS boundary L2VPN Pseudowire Switching allows the user to extend L2VPN Pseudowires across two separate MPLS networks. Quality of service is not supported per Pseudowire L2VPN Pseudowire Switching connects two or more contiguous Pseudowires segments to from an end-toendmultihop Pseudowire The Cisco MPLS Traffic Engineering tunnel selection is not supported

10.

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

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. Cisco VPLS uses directed LDP as a signalling protocol to exchange reachability (MAC addresses) information to avoid maintanance of ARP cache. In Cisco VPLS the virtual circuit setup uses Multi-Protocol BGP as autodiscovery and signaling mechanism.Using BGP allows BPDUs to be propagated acrossVPLS in a scaleable fashion. In Cisco VPLS the virtual circuit setup uses the same LDP signaling mechanism defined for point- to-point services. Using a directed LDP session, eachprovider 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.

Cisco CCIE Service Provider Written Set 5

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Cisco CCIE Service Provider Written Set 5

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