Refer to the exhibit. Router R13 is operating in Level 1 /Level 2 mode. A network engineer with an employee ID 5232:18:872 must change the IS-IS cost of the route IP address 10.212.124.1 to 90. The metric update must be carried over in TVL 128. Which configuration must be implemented to complete the task?
Answer(s): A
To change the IS-IS path cost seen by the neighbor for reaching 10.212.124.1, you adjust the outgoing interface cost on the advertising/forwarding side toward that neighbor. Setting the IS-IS interface metric to 90 on R12's link toward R13 updates the computed route metric, and with wide metrics in use the value is carried in TLV 128.
Refer to the exhibit. OSPF is running in the given network. R1 was previously running EIGRP on a standalone network, and a network engineer just migrated it to OSPF. The R1 peering with R2 has come up. Which additional action must the engineer take so that R2 receives routes from Area 1 and Area 0 but it is prevented from receiving routes from Area 2?
Answer(s): C
To stop R2 from installing routes learned from Area 2 while still allowing routes from Area 0 and Area 1, the correct method is to filter OSPF routes on R2 as they are learned. This is done with an inbound distribute-list that references a route map which matches the specific prefixes originating from Area 2 using an access control list.
Refer to the exhibit. CE1 and CE2 reside in AS 65516 and access the internet through PE1, which resides in AS 65517. The PE-CE routing protocol is BGP, and CE1 and CE2 have an established iBGP peering. A network engineer must implement a route map on CE1 so that it becomes the preferred entry point for traffic from PE1. Which action must the engineer take to meet the requirement?
Answer(s): B
To make CE1 the preferred entry point for traffic coming from the directly connected provider router, CE1 must influence the provider's best-path choice between the two customer links. The attribute intended for this purpose is MED, which is compared by the neighboring AS to pick the better entry when multiple links exist to the same customer AS. Setting a lower MED on advertisements from CE1 toward PE1 makes PE1 prefer CE1 over CE2 for inbound traffic.
Refer to the exhibit. Company A is running OSPF within its network, comprised of routers R2, R3, R4, and R5 and consisting of two areas. Company A just acquired Company B, which uses EIGRP on its own R1. R1 has several routes in its routing table. The network engineering team at Company A needs access to the Company B network to manage network devices there, but each company will otherwise operate independently. R2 will serve as the ASBR between the two networks. Which action must the team take to reduce the number of EIGRP routes received on R2 and include only the necessary routes in the routing table?
To reduce the number of EIGRP routes that R2 installs while still learning only the prefixes needed to manage Company B, the team should filter routes as they are learned from R1. An inbound distribute list on R2 using a route map can explicitly permit only the required EIGRP prefixes, preventing all other EIGRP routes from entering R2's routing table.
What is the purpose of DS-Lite technology?
Dual-Stack Lite enables IPv4 packets from customer networks to be encapsulated inside IPv6 and transported across an IPv6-only ISP backbone. The IPv4 traffic is tunneled to a carrier-grade NAT device in the provider network, allowing continued IPv4 connectivity without requiring native IPv4 support throughout the ISP core.
Refer to the exhibit. The enterprise is running BGP between sites to provide connectivity to users across the company's geographic regions. A network engineer must update the configuration so that the operations team can confirm that BGP prefixes that are received on each router originated from the correct autonomous system.Which configuration must the engineer apply?
Answer(s): D
To confirm that received BGP prefixes originated from the correct autonomous system, the network must validate route origin using RPKI (Route Origin Validation). Configuring an RPKI cache server allows the routers to verify the prefix-to-origin-AS authorization information and mark routes as valid/invalid based on that validation.
Refer to the exhibit. The company is running IS-IS in its core. A network engineer must segment the network into two areas to isolate departments. However, some networks must be shared from area 2 to area 1, so the engineer has decided to implement route filtering between devices. Which action must the engineer take so that the correct networks are shared between IS-IS areas?
IS-IS inter-area control is typically handled on the L1/L2 boundary by selectively leaking routes between areas.Route tagging allows the engineer to mark the specific prefixes that are permitted to be shared from area 2 and then filter based on those tags when advertising into area 1, ensuring only the intended networks are leaked between IS-IS areas.
Refer to the exhibit. Routers R1 and R2 are connected over the internet, with the connection passing over four different autonomous systems. The company must mitigate potential DDoS attacks and protect the CPUs of the routers. A network engineer must secure all external connections on edge router R1 based on RFC 5082. R2 has already been secured. Which task should the engineer perform on R1 to achieve the goal?
RFC 5082 defines BGP TTL Security (GTSM), which protects router CPUs by accepting BGP packets only if their TTL indicates they originated within an expected hop count. Because the peers are separated by four autonomous systems, configuring TTL security with a hop count of 4 on R1 enforces that validation on the external BGP session.
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