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

ORIGINATOR_ID

Answer

LOCAL_PREF

Answer

COMMUNITY

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

Assign subnets randomly from the available pool

Answer

Use /30 point-to-point links everywhere

Answer

Deploy NAT at every distribution layer router

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

P router (Provider core)

Answer

CE router (Customer Edge)

Answer

RR for the underlay IGP

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

HSRP with default timers and Rapid PVST+

Answer

VRRP with 3-second hello timers

Answer

STP PortFast on uplinks with HSRP preempt

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

FIFO queuing

Answer

Weighted Fair Queuing (WFQ)

Answer

Custom Queuing (CQ)

Question 6

When designing OSPF for a large enterprise with 500+ routers, which design choice most effectively reduces CPU and memory consumption on all routers?

Accepted Answer

Segment routers into multiple areas with summarization at ABRs

Answer

Use OSPF area 0 for all routers

Answer

Enable OSPF fast hello packets globally

Answer

Configure all non-DR routers as stub routers

Question 7

A company requires that customer branch offices connect to headquarters using encrypted tunnels over the internet with hub-and-spoke topology but dynamic spoke-to-spoke tunnels on demand. Which Cisco technology fits this design?

Accepted Answer

DMVPN (Dynamic Multipoint VPN)

Answer

Static point-to-point GRE tunnels

Answer

IPsec tunnel mode only

Answer

MPLS L2VPN with pseudowires