CCIE CCIE Network Design 2

Question 1

When designing a BGP route reflector (RR) cluster, which attribute prevents routing loops between route reflectors in the same cluster?

Accepted Answer

CLUSTER_LIST

Answer

CLUSTER_LIST is appended by each RR as it reflects routes; a router that sees its own cluster ID in the CLUSTER_LIST discards the update, preventing intra-cluster loops.

Question 2

A network designer is planning IP address space for a large enterprise with 500 subnets. Which practice best supports route summarization to minimize routing table size at the core?

Accepted Answer

Allocate contiguous IP blocks aligned to summarization boundaries per site

Answer

Allocating contiguous, boundary-aligned IP blocks per region or site allows a single summary route to represent hundreds of subnets, minimizing core routing table entries.

Question 3

In an MPLS L3VPN design, which component is responsible for maintaining per-VPN routing tables and distributing VPN routes using MP-BGP with VPNv4 address families?

Accepted Answer

PE router (Provider Edge)

Answer

PE routers maintain VRF tables per customer VPN, import/export routes using Route Distinguishers and Route Targets, and exchange VPNv4 prefixes with other PEs via MP-BGP.

Question 4

A designer must ensure that a campus network can recover from a distribution-layer switch failure in under 1 second. Which combination of technologies best achieves this?

Accepted Answer

StackWise Virtual with ECMP and BFD-triggered BGP

Answer

StackWise Virtual eliminates the virtual gateway failover step entirely, while BFD provides sub-second failure detection and ECMP uses all uplinks simultaneously for instant path switching.

Question 5

Which QoS queuing mechanism is recommended for voice traffic in an enterprise WAN design to guarantee bandwidth and minimize jitter?

Accepted Answer

Low Latency Queuing (LLQ)

Answer

LLQ combines Priority Queuing for strict latency-sensitive traffic (like voice) with class-based WFQ for other classes, guaranteeing bandwidth while preventing queue starvation.

CCIE - Cisco Certified Internetwork Expert Practice Test

CCIE - Cisco Certified Internetwork Expert Practice Test

CCIE CCIE Network Design 2