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CCIE Theory MPLS
CCIE theory Implement MPLS layer 3 VPNs
| Question | Answer |
|---|---|
| Refer to the exhibit: Show run vrf 999 ip vrf 999 rd 99.99.99.99:99 route-target export 99:99 route-target import 99:99 | The RD is a type 1 RD |
| Which command should be used on a PE router to connect to a CE router(11.1.1.4) in VRF red | telnet 11.1.1.4 /vrf red |
| Which of the following is true about the MPLS header and its EXP filed size? | The MPLS header is 4 bytes and the EXP field is 3 bits long |
| What is the Cisco IOS command to turn on the explicit null forwarding by LDP? | mpls ldp explicit-null |
| Which command can be used on a PE router to connect to a CE router (11.1.1.4) in VRF red? | telnet 11.1.1.4 /vrf red |
| Which two fundamental modifications, related to traffic forwarding, does MPLS introduce? | 1 IP destination is reduced to label lookup within the MPLS network 2 For unicast routing labels are assigned to FECs(in other words, IP prefixes) |
| What are the "bound IP addresses" used for in LDP? | These addresses are used to find the label binding to put in the LFIB, by looking up these IP addresses in the routing table |
| Which statement correctly describes the disabling of IP TTL propagation in an MPLS network? | The TTL field of the MPLS label header is set to 255 |
| For which routes does LDP advertise a label binding? | only the IGP routes in the routing table |
| Which three are needed to run VRF lite for IPv6 on a router? | 1 VRF definition for IPv6 2 VRF-enabled routing protocol 3 VRF-enabled interface |
| What does the OSPF command capability VRF-lite achieve? | It disables provider edge(PE) specific checks on a router when the OSPF process is associated with the VRF |
| Which of these statements about penultimate hop popping are true? | 1 It enables edge LSR to request a label pop operation from upstream neighbors 2 It's requested through TDP using a special label that is also called implicit-null 3 It's requested through LDP using special label value that is also called implicit-null |
| A network is composed of several VRFs. Its is required that VRF users VRF_A and VRF_B be able to route to and from VRF_C, which hosts shared services. However, traffic must not be allowed to flow between VRF_A and VRF_B. How can this be accomplished? | import and export using route targets |
| which two of these parameters are used to determine a forwarding equivalence class? | 1 IP prefix 2 layer 2 circuit |
| Multi protocol Label Switching (MPLS)is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label, if the stack bit is set to 1, which option is true? | The label is the last entry in the label stack. |
| A request arrived on the MPLS-vpn-bgp group. You apply a outbound ACL filter using the appropriate MPLS-EBGP tool access-list 1 deny 200.0.10.0 255.255.254.0 access-list 1 permit any what happens when you apply this ACL on the MPLS-EBGP connection to BHK? | It blocks the routes 200.0.12.0/24, 200.0.10.0/24 only |
| Which of these tables is used by an LSR to perform a forwarding lookup for a packet destined to an address within an RFC 4364 VPN? | LFIB |
| This is an MPLS VPN network with OSPF as the PE-CE routing protocol. Which statement is correct? | The routing inside the VPN RED will work without any special OSPF configuration |
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