As part of the security protocol for your network design, you have designated that option 82 is enabled for DHCP snooping. When option 82 is enabled, which information will be added to the DHCP reques

The correct answer is A. switch MAC address and VLAN, module, and port. Remote ID and Circuit ID is a generic specification for option 82, while cisco switch implementation though is based on specific values, here’s the excerpt from our spec: - Circuit ID Sub-option value is defined as combination of port’s VLAN number, module number and port number:

Designing Security

Question

As part of the security protocol for your network design, you have designated that option 82 is enabled for DHCP snooping. When option 82 is enabled, which information will be added to the DHCP request?

Options

Aswitch MAC address and VLAN, module, and port
Bremote ID and circuit ID
Cswitch IP address and VLAN, module, and port
Dswitch MAC address and switch IP address

How the community answered

(37 responses)

A
95% (35)
B
3% (1)
D
3% (1)

Explanation

Remote ID and Circuit ID is a generic specification for option 82, while cisco switch implementation though is based on specific values, here’s the excerpt from our spec: - Circuit ID Sub-option value is defined as combination of port’s VLAN number, module number and port number: subopt len cidtype len +-–+-–+-–+-–+-–+-–+-–+-–+ | 1 | 6 | 0 | 4 | VLAN | mod |port | +-–+-–+-–+-–+-–+-–+-–+-–+ - Remote ID Sub-option value is defined as access switch’s Mac address: subopt len ridtype len +-–+-–+-–+-–+-–+-–+-–+-–+-–+-–+ | 2 | 8 | 0 | 6 | Mac Address | +-–+-–+-–+-–+-–+-–+-–+-–+-–+-–+

Topics

#DHCP option 82#DHCP snooping#circuit ID#relay agent information

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