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?
A. switch MAC address and VLAN, module, and port
B. remote ID and circuit ID
C. switch IP address and VLAN, module, and port
D. switch MAC address and switch IP address
Answer: A
Explanation:
Correct answer is B not A for this one.
DHCP option 82 add remote ID and circuit ID information
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I believe both A, B are right:
When the switch receives the DHCP request, it adds the option-82 information in the packet. The option-82 information contains the switch MAC address (the remote ID suboption) and the port identifier, vlan-mod-port, from which the packet is received (the circuit ID suboption).
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looking in more detail, I think “vlan-mod-port” is different from “module”. If this is correct then Correct option is B.
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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 |
+—–+—–+—–+—–+—–+—–+—–+—–+—–+—–+
Thus while A and B are both correct answers B is more generic and A and more specific, so the final answer is A
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And, part of that new 493Q 352-001 dumps FYI:
https://drive.google.com/open?id=0B-ob6L_QjGLpflFYOFdyS1ctQVc2X1cwT0d2R2dyZzBsb2hPaGw5V2Y5akx5QmxxYUdOOUU
Best Regards!
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