Question

which of the following protocols work at the transport layer? (select two)
transmission control protocol (tcp)
enhanced interior gateway routing protocol (eigrp)
internet control message protocol (icmp)
user datagram protocol (udp)
internet group messaging protocol (igmp)

Explanation:

The Transport layer of the OSI model manages end-to-end communication. TCP and UDP are core Transport layer protocols: TCP provides reliable, connection-oriented transmission; UDP provides fast, connectionless transmission. EIGRP (routing), ICMP (network layer messaging), and IGMP (multicast group management) operate at lower layers (Network or Routing layers).

Answer:

Transmission Control Protocol (TCP), User Datagram Protocol (UDP)