In MPLS Layer 3 VPN implementations, which mechanism is used to control which routes are imported to a VRF?
Answer : A
Explanation:
http://blog.initialdraft.com/archives/1537/
Refer to the partial Cisco IOS XR PE router VRF configuration exhibit.
Answer : A
Which two Layer 2 VPN methods support interworking between customer sites with different Layer 2 encapsulation at each end (for example, Frame Relay to Ethernet interworking)? (Choose two.)
Answer : A,D
Explanation:
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html#wp1040784
The Layer 2 Tunnel Protocol Version 3 feature expands on Cisco support of the Layer 2
Tunnel Protocol Version 3 (L2TPv3). L2TPv3 is an Internet Engineering Task Force (IETF) l2tpext working group draft that provides several enhancements to L2TP for the capability to tunnel any Layer 2 payload over L2TP.
Specifically, L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core network using Layer 2 virtual private networks (VPNs). Benefits of this feature include the following:
L2TPv3 simplifies deployment of VPNs
L2TPv3 does not require Multiprotocol Label Switching
L2TPv3 supports Layer 2 tunneling over IP for any payload
http://www.cisco.com/en/US/products/ps6646/products_ios_protocol_option_home.html
Cisco Any Transport over MPLS (AToM) is a solution for transporting Layer 2 packets over an MPLS backbone. It enables Service Providers to supply connectivity between customer sites with existing data link layer (Layer 2) networks via a single, integrated, packet-based network infrastructure: a Cisco MPLS network. Without separate networks that each have network management environments, Service Providers can deliver Layer 2 connections over an MPLS backbone.
Cisco AToM provides a common framework to encapsulate and transport supported Layer
2 traffic types over an MPLS network core. Service Providers can use a single MPLS network infrastructure to offer connectivity for supported Layer 2 traffic and for IP traffic in
Layer 3 VPNs.
Which flavor of MPLS Layer 3 VPN has MPLS enabled on PE-CE links?
Answer : B
Explanation:
http://www.cisco.com/en/US/docs/ios/12_0st/12_0st14/feature/guide/csc.html
Which two statements about implementing a separate MPLS VPN to provide customers
Internet access are correct? (Choose two.)
Answer : A,C
A PE configured with VRF ABC needs to export only subnet 1.1.1.1/32 with RT 100:100 without losing its original RT 200:200 to a remote PE. Which configuration is correct?
A)
Answer : C
When implementing EoMPLS on Cisco IOS XR routers, which command under the l2vpn configuration mode is used to define the pseudowire?
Answer : B
Explanation:
http://www.cisco.com/en/US/docs/wireless/asr_901/Configuration/Guide/eompls.html
When configuring an EoMPLS PW on a Cisco IOS XR router, what are the two supported transport modes? (Choose two.)
Answer : A,C
Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/mpls/configuration/guide/gc38v2.ht ml#wp1072883
Ethernet Port Mode -
Ethernet Remote Port Shutdown -
VLAN Mode -
Inter-AS Mode -
QinQ Mode -
QinAny Mode -
Mac-in-Mac Protocol (Provide Backbone Bridging)
Refer to the partial Cisco IOS XR PE router configuration exhibit for supporting a Layer 3
MPLS VPN customer using BGP as the CE-to-PE routing protocol.
Answer : A
Explanation:
http://www.cisco.com/en/US/docs/ios/12_2sr/12_2sra/feature/guide/srbgprid.html
Route Distinguisher -
A router distinguisher (RD) creates routing and forwarding tables and specifies the default route distinguisher for a VPN. The RD is added to the beginning of an IPv4 prefix to change it into a globally unique VPN-IPv4 prefix. An RD can be composed in one of two ways: with an autonomous system number and an arbitrary number or with an IP address and an arbitrary number. You can enter an RD in either of these formats:
Enter a 16-bit autonomous system number, a colon, and a 32-bit number. For example:
45000:3
Enter a 32-bit IP address, a colon, and a 16-bit number. For example:
192.168.10.15:1
What is an advantage of using the Cisco EVC infrastructure to implement carrier-class
Ethernet services that are not available on non-EVC-capable platforms?
Answer : D
Explanation:
http://www.cisco.com/web/YU/events/expo_08/pdfs/Carrier_Ethernet_Marek_Moskal.pdf
On Cisco IOS XR platforms using the EVC infrastructure, which command is used to enable a Layer 2 VPN subinterface?
Answer : E
Implementing H-VPLS instead of VPLS reduces which requirement?
Answer : A
Refer to the exhibit.
Answer : C
A customer is connecting toa Cisco IOS XR PE device via BGP. The peering session is up and the customer is advertising routes, but the provider is not receiving any. Which issue is the most likely cause?
Answer : A