Which port is ISAKMP?

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Prepare for the Certified Ethical Hacker Version 11 Exam. Study with comprehensive questions and explanations. Equip yourself with the skills needed for success!

Multiple Choice

Which port is ISAKMP?

Explanation:
ISAKMP is the protocol used to set up IPsec security associations and exchange cryptographic keys. The standard port for ISAKMP traffic is UDP 500, which is what initial IPsec negotiations ride over. If NAT traversal is involved, later phases may use UDP 4500, but the original ISAKMP communications occur on port 500. The other ports listed belong to different services: HTTPS normally uses TCP/UDP 443, SNMP traps use 162, and IMAP uses 143. So the port associated with ISAKMP is 500/UDP.

ISAKMP is the protocol used to set up IPsec security associations and exchange cryptographic keys. The standard port for ISAKMP traffic is UDP 500, which is what initial IPsec negotiations ride over. If NAT traversal is involved, later phases may use UDP 4500, but the original ISAKMP communications occur on port 500. The other ports listed belong to different services: HTTPS normally uses TCP/UDP 443, SNMP traps use 162, and IMAP uses 143. So the port associated with ISAKMP is 500/UDP.

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