A network analyst logs UDP port 3544; which technology might be involved?

A network analyst logs UDP port 3544; which technology might be involved?

• A. SSH
• B. Teredo
• C. DNS over UDP
• D. SNMP

Answer: (B)

UDP port 3544 is the default port Teredo uses for its tunneling traffic. Teredo is an IPv6 transition technology that encapsulates IPv6 packets inside UDP over IPv4 to traverse NATs. When a network log shows UDP 3544, it’s a strong clue that Teredo tunneling is involved, because other options use different, standard ports (SSH typically TCP 22, DNS over UDP typically UDP 53, SNMP typically UDP 161/162). So the observed port aligns with Teredo traffic and points to that technology being in play.

UDP port 3544 is the default port Teredo uses for its tunneling traffic. Teredo is an IPv6 transition technology that encapsulates IPv6 packets inside UDP over IPv4 to traverse NATs. When a network log shows UDP 3544, it’s a strong clue that Teredo tunneling is involved, because other options use different, standard ports (SSH typically TCP 22, DNS over UDP typically UDP 53, SNMP typically UDP 161/162). So the observed port aligns with Teredo traffic and points to that technology being in play.