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QUESTION 469
You need to configure a single router into load balancing traffic across 4 unequal cost paths. Which routing
protocols can satisfy this requirement? (Select two)
A. RIP v1
B. RIP v2
C. IGRP
D. EIGRP
E. OSPF
F. IS-IS

Answer: CD

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
In general, load balancing is the capability of a router to distribute traffic over all its network ports that are the
same distance from the destination address. Load balancing increases the utilization of network segments,
thus increasing effective network bandwidth. There are two types of load balancing: equal cost path and
unequal cost path.
Every routing protocol supports equal cost path load balancing. In addition to that, IGRP and EIGRP also
support unequal cost path load balancing, which is known as variance.
The variance command instructs the router to include routes with a metric less than n times the minimum
metric route for that destination, where n is the number specified by the variance command. The variable n can
take a value between 1 and 128, with the default being 1, which means equal cost load balancing (variance
for example. Traffic is also distributed proportionally among unequal cost links, with respect to the metric.

QUESTION 470
You need to choose a routing protocol for a new Certifyme network. This network will be running IP, IPX, and
AppleTalk, and you wish to utilize only one routing protocol. Which one would be the best choice?
A. OSPF
B. EIGRP
C. RIP v2
D. IGRP
E. RIP v1

Answer: B

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
Only EIGRP provides routing protocol support for IP, IPX, and AppleTalk networks.

QUESTION 471
Which of the routing protocols shown below support both VLSM and route summarization? (Select three)
A. IGRP
B. EIGRP
C. RIP v1
D. RIP v2
E. OSPF
F. VTP
G. CDP

Answer: BDE

Section: CONFIGURE, VERIFY, AND TROUBLESHOOT BASIC ROUTER OPERATION AND ROUTING ON
CISCO DEVICES
Explanation/Reference:
Explanation:
EIGRP and OSPF support Variable Length Subnet Masks (VLSM) and provide for both automatic and manual
route summarization configurations. RIPv2 is an enhanced version of RIP, and overcame some of the
limitations of RIP by introducing support for VLSM.
Incorrect Answers:
A, C: IGRP and RIP are relatively old and simplistic routing protocols that were developed before the concepts
of VLSM and route summarization.
F. VTP is the VLAN Trunking Protocol, used in switched LAN environments to carry VLAN information. It is not
a routing protocol.
G. CDP is the Cisco Discovery Protocol, used between neighboring Cisco devices to automatically discover
information. It is not a routing protocol.