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Difficulty: EasyFirst Hop Redundancy Protocols (HSRP and VRRP)

A network administrator is configuring HSRP on a router's GigabitEthernet0/0 interface, which has been assigned the physical IPv4 address 192.168.10.1/24192.168.10.1/24. The administrator enters the command `standby 1 ip 192.168.10.1` under the interface configuration mode. What issue does this configuration introduce?

  1. It configures the HSRP virtual IP address to match a physical interface IP address, which is invalid in HSRP.Answer
  2. B
    It creates a broadcast domain conflict by forcing the interface to forward all frame traffic to a multicast MAC address.
  3. C
    It overrides the longest prefix match rule in the IPv4 routing table for all connected networks.
  4. D
    It automatically converts the HSRP group into a floating static route with an administrative distance of 255.

Answer

Assigning the physical interface IPv4 address as the HSRP virtual IP address is an invalid configuration because HSRP requires the virtual IP to be a separate, distinct IP address within the subnet.
In Cisco Hot Standby Router Protocol (HSRP), the virtual IP address shared by the group must be a unique IP address on the local subnet that is not assigned to any router's physical interface. Attempting to assign a router's physical IP address as the HSRP virtual IP address is invalid and prevents proper operation.

Step-by-Step Solution

1
Identify the IP address assigned to the physical interface and the IP address specified in the `standby` command.
The physical interface IP address is 192.168.10.1192.168.10.1, and the command sets the virtual IP to 192.168.10.1192.168.10.1.
Comparing these addresses verifies whether the virtual IP collides with a physical IP.
2
Recall HSRP rules regarding virtual IP address assignment.
Unlike VRRP (which allows owning the IP address), HSRP requires the virtual IP address to be an unused IP address on the subnet, distinct from all router physical interface IPs in the group.
Enforces proper HSRP protocol behavior and prevents address duplicate conflicts.

Key Concept

HSRP Virtual IP Address Assignment Rules
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Topics

First Hop Redundancy Protocols (HSRP and VRRP)

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