Here you will find answers to MPLS questions
Question 1
Study the exhibit carefully.
A - Before MPLS is enabled, the ip cef command is only requited on routers 1 and 4.
B - After MPLS is enabled, the ip cef command is only required on routers 1 and 4.
C - Before MPLS is enabled, the ip cef command is only required on the Ethernet 0 interfaces of routers 1 and 4.
D - After MPLS is enabled, the ip cef command is only required on the Ethernet 0 interfaces of routers 1 and 4.
E - Before MPLS is enabled, the ip cef command must be applied to all provider routers.
Answer: E
Explanation
CEF is the fundamental requirement of the MPLS architecture and must be enabled globally on all routers that want to use MPLS.
Question 2
A new router was configured with the following commands:
| ip cef ! interface Serial 3/1 ip access-group block in interface Serial 2/1 mpls ip ! ip access list block deny tcp any any eq 711 ip access list block permit ip any any |
The configuration above was found on an Internet Service Provider's (ISP) Multiprotocol Label Switching (MPLS) network. What is its purpose?
A - To prevent customers from running TDP with the ISP routers
B - To prevent customers from running LDP with the ISP routers
C - To prevent other ISPs from running LDP with the ISP routers
D - To prevent man-in-the-middle attacks
E - To use CBAC to shut down Distributed Denial of Service attacks
F - To use IPS to protect against session-replay attacks
G - None of the above
Answer: A
Explanation
The 711 port is used for Tag Distribution Protocol (TDP) and the administrator usually wants to block this type of traffic between the ISP and customer routers due to security reason. By doing this, the TDP neighbor session between the customer and ISP routers will not be formed.
