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200-101 · Question #175

A network administrator receives an error message while trying to configure the Ethernet interface of a router with IP address 10.24.24.24/29. Which statement explains the reason for this issue?

The correct answer is B. This address is a network address.. 10.24.24.24 with a /29 prefix cannot be assigned to a router interface because it falls exactly on a subnet boundary, making it a network address rather than a valid host address.

Troubleshoot Basic Connectivity

Question

A network administrator receives an error message while trying to configure the Ethernet interface of a router with IP address 10.24.24.24/29. Which statement explains the reason for this issue?

Options

  • AVLSM-capable routing protocols must be enabled first on the router.
  • BThis address is a network address.
  • CThis address is a broadcast address.
  • DThe Ethernet interface is faulty.

How the community answered

(24 responses)
  • A
    4% (1)
  • B
    75% (18)
  • C
    8% (2)
  • D
    13% (3)

Why each option

10.24.24.24 with a /29 prefix cannot be assigned to a router interface because it falls exactly on a subnet boundary, making it a network address rather than a valid host address.

AVLSM-capable routing protocols must be enabled first on the router.

VLSM capability is a property of routing protocols used to advertise subnet information, not a prerequisite for assigning an IP address to an interface; the error is caused by the address value itself.

BThis address is a network address.Correct

A /29 prefix corresponds to subnet mask 255.255.255.248, which creates subnets in increments of 8 within the last octet. The subnet boundaries are .0, .8, .16, .24, .32, and so on - meaning 10.24.24.24 is exactly the network address of the 10.24.24.24/29 subnet. The valid host range for this subnet is 10.24.24.25 through 10.24.24.30, with 10.24.24.31 as the broadcast address.

CThis address is a broadcast address.

The broadcast address for the 10.24.24.24/29 subnet is 10.24.24.31 - the last address in the block - not 10.24.24.24.

DThe Ethernet interface is faulty.

The router returned a software configuration error related to an invalid IP address, which is an addressing logic issue and has nothing to do with the physical state of the Ethernet interface.

Concept tested: IPv4 /29 subnet boundary and network address identification

Source: https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html

Topics

#IP addressing#network address#/29 subnet#subnetting

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