Which protocol should be configured if a network administrator has the following requirements?
Multiple physical gateways participating simultaneously in packet forwarding.
All hosts in the VLAN configured with the same default gateway address.
A.
HSRP
B.
VRRP
C.
GLBP
D.
VTP
Explanation:
Gateway Load Balancing Protocol (GLBP) is a Cisco proprietary protocol that attempts to overcome the limitations of existing redundant router protocols by adding
basic load balancing functionality.
In addition to being able to set priorities on different gateway routers, GLBP allows a weighting parameter to be set. Based on this weighting (compared to others in
the same virtual router group), ARP requests will be answered with MAC addresses pointing to different routers. Thus, by default, load balancing is not based on
traffic load, but rather on the number of hosts that will use each gateway router. By default GLBP load balances in round-robin fashion.
GLBP elects one AVG (Active Virtual Gateway) for each group. Other group members act as backup in case of AVG failure. In case there are more than two
members, the second best AVG is placed in the Standby state and all other members are placed in the Listening state. This is monitored using hello and holdtime
timers, which are 3 and 10 seconds by default. The elected AVG then assigns a virtual MAC address to each member of the GLBP group, including itself, thus
enabling AVFs (Active Virtual Forwarders). Each AVF assumes responsibility for forwarding packets sent to its virtual MAC address. There could be up to four AVFs
at the same time.
By default, GLBP routers use the local multicast address 224.0.0.102 to send hello packets to their peers every 3 seconds over UDP 3222 (source and destination).
Cisco implemented IPv6 support for GLBP in IOS release 12.2(33)SXI.
https://en.wikipedia.org/wiki/Gateway_Load_Balancing_Protocol
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