Which two routing protocols support Cisco MPLS TE tunnels? (Choose two.)
Answer(s): D,E
Refer to the exhibit. Router 1 and router 2 are running OSPF Area 0. The router logs on both routers show that the LDP link has flapped. Which configuration must the engineer apply to the two routers to implement session protection on the link?
Answer(s): D
Refer to the exhibit. A network operator working for a telecommunication company with an employee id:1234:56:789 is implementing a Cisco Unified MPLS solution. What is the effect of this implementation?
Answer(s): A
A network engineer is configuring a newly installed PE router at the regional gateway location. The new PE router must use MPLS core routing protocols with the existing P router, and LDP sessions between the two routers must be protected to provide faster MPLS convergence. Which configuration must the engineer perform on the network so that LDP sessions are established?
Answer(s): C
How do CSC VPN services use BGP to support connectivity between customer sites?
CSC (Carrier Supporting Carrier) VPN services leverage BGP to exchange labeled routes between the customer service provider's PE routers and the backbone carrier's PE routers. BGP is used to distribute labels for the customer prefixes, enabling MPLS label switching across the backbone carrier. This allows seamless traffic flow between customer sites while maintaining scalability and efficiency.
Refer to the exhibit. OSPF is configured within the core of the service provider network. Connectivity between CE1 and CE2 is provided through the core. An engineer is implementing MPLS to support traffic exchange between customer sites using Layer 3 VPNs. Which task must the engineer perform to secure VPN traffic to meet the SLA of continuous uptime?
LDP (Label Distribution Protocol) sync ensures that IGP (OSPF in this case) does not advertise a route into the network until the LDP label bindings for that route are established. This prevents blackholing of traffic during convergence events or label setup. By synchronizing LDP with OSPF, MPLS Layer 3 VPN traffic can flow seamlessly without interruptions, meeting SLA requirements for continuous uptime.
Refer to the exhibit. Company A is connected to multiple upstream ISPs, with ISP_A serving as the primary upstream ISP. The company A subnet 172.43.232.0 should be announced to the secondary ISP_B only when the FTP server with IP address 10.10.1.1 is not accessible via the primary ISP. Which configuration must be applied on R1?
To control the advertisement of the 172.43.232.0/23 subnet to ISP_B, the advertise-map and non-exist- map BGP commands are used. The advertise-map specifies the route to advertise (in this case, the route- map Advertise-route), and the non-exist-map defines the condition under which the route is advertised (in this case, when the FTP server with IP 10.10.1.1 is not accessible via ISP_A).The Advertise-route route-map matches the subnet 172.43.232.0/23.The Non-RIB route-map matches the FTP server IP address 10.10.1.1. If the route to the FTP server is absent in the routing table (indicating inaccessibility), the subnet will be advertised to ISP_B.
Refer to the exhibit. Customer C-101 in ASN 65123 requested that the ISP blackholes a host route 198.19.44.195, to which the customer is receiving a significant amount of malicious traffic. Which configuration must the network engineer implement on the trigger router TR-1 to fulfill the request without affecting other IP destinations in the customer's block?
Answer(s): B
To implement a blackhole for the specific host route 198.19.44.195/32, the network engineer must:1. Define a prefix list: The prefix list BLACKHOLE-PERMIT must allow only the specific IP 198.19.44.195/32 to avoid affecting other destinations in the 198.19.44.0/24 block.2. Static route to Null0: The IP route for 198.19.44.195/32 must point to Null0, ensuring that traffic destined for this host is dropped. The tag 9090 is used for tracking and redistributing this blackhole route in BGP.
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