Exam 300-115 topic 5 question 336 discussion

Actual exam question from Cisco's 300-115

Question #: 336
Topic #: 5

[All 300-115 Questions]

Which First Hop Redundancy Protocol is an IEEE Standard?

A. GLBP
B. HSRP
C. VRRP
D. OSPF

Show Suggested Answer

Suggested Answer: Explanation 🗳️
A comparison of the three First Hop Redundancy Protocols are listed below:

GLBP -

HSRP VRRP -

Protocol -
(Gateway Load
(Hot Standby Router (Virtual Redundancy

Features -
Balancing Pro-
protocol) Router Protocol)
tocol)
- 1 AVG (Ac-
tive Virtual

Gateway).- up -
to 4 AVF
routers on the
- 1 active router.- 1 group (Active
- 1 master router.- 1
standby router.- 1 or Virtual For-
or more backup
more listening warder) passing
routers.
routers. traffic.- up to

Router role -
1024 virtual
routers (GLBP
groups) per
physical inter-
face.
- Can use real router
- Use virtual ip ad- ip address, if not, the - Use virtual ip dress. one with highest pri- address. ority become master.
Cisco propri-
Scope Cisco proprietary IEEE standard
etary

Active Virtual -
Active Router: Master Router: (*) Gateway:
1-Highest Priority 1-Highest Priority 1-Highest Pri-

Election -
2-Highest IP 2-Highest IP ority
(tiebreaker) (tiebreaker) 2-Highest IP
(tiebreaker)

Tracking yes yes yes -

Optimization -

Preempt yes yes yes -
features
Timer ad-
yes yes yes
justments
Traffic type 224.0.0.2 udp 1985 224.0.0.18 IP 112 224.0.0.102 udp (version1) 3222
224.0.0.102-udp 1985
(version2)
Advertisement 1 Hello 3 sec-

Hello 3 seconds -
second onds
(Master Down Inter-

Timers val)3 * Advertisement -
(Hold) 10 sec-
+ skew time
(Hold) 10 seconds
onds
(Skew time)(256-pri-
ority) / 256

Load-balancing -
oriented-
Weighted algo-
- Multiple HSRP - Multiple VRRP
rithm.- Host-de-
group per in- group per in-
pendent algo-
terface/SVI/routed terface/SVI/routed
rithm.
int. int.
- Round-Robin
algorithm (de-
fault).
Load-balancing functional-

Clients are -
ity
transparently
updated with
Requires appropriate Requires appropriate
virtual MAC
distribution of Virtual distribution of Virtual
according to
GW IP per Clients for GW IP per Clients for
load-balancing
optimal load-balanc- optimal load-balanc-
algorithm
ing.(generally through ing.(generally through
through ARP
DHCP) DHCP)
requesting a
unique virtual
gateway.
Reference: http://cciethebeginning.wordpress.com/2008/08/23/router-high-availability-protocol- comparison-2/

by 0nsp33d at Jan. 6, 2020, 1:44 p.m.

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0nsp33d

5 years, 5 months ago

Answer C:

upvoted 2 times

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