3.3.6 Check Your Understanding – Protocol Suites Answers

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1. UDP and TCP belong to which layer of the TCP/IP model?

  • Application
  • Transport ✅
  • Internet
  • Network access

Explanation: TCP and UDP are both transport-layer protocols.

2. Which two protocols belong to the application layer of the TCP/IP model? (Choose two.)

  • EIGRP
  • DNS ✅
  • OSPF
  • ICMP
  • DHCP ✅

Explanation: Domain Name System (DNS) and Dynamic Host Configuration Protocol (DHCP) operate at the application layer.

3. Which protocol operates at the network access layer of the TCP/IP model?

  • HTTP
  • IP
  • DNS
  • Ethernet ✅

Explanation: Ethernet operates at the network access layer of the TCP/IP model.

4. Which two protocols provide feedback about packet-delivery errors? (Choose two.)

  • IPv4
  • TCP
  • ICMPv4 ✅
  • IPv6
  • UDP
  • ICMPv6 ✅

Explanation: ICMPv4 and ICMPv6 provide feedback when errors occur during packet delivery.

5. A device receives a data-link frame and removes the Ethernet information. What information is processed next?

  • HTTP at the application layer
  • HTML at the application layer
  • IP at the internet layer ✅
  • UDP at the internet layer
  • TCP at the transport layer

Explanation: During de-encapsulation, the device removes the Ethernet frame information. It then processes the IP packet at the internet layer.

6. Which three services are provided by the internet layer of the TCP/IP protocol suite? (Choose three.)

  • File transfer
  • Address resolution
  • Routing protocols ✅
  • Messaging ✅
  • Ethernet
  • Internet Protocol ✅

Explanation: Internet Protocol (IP), messaging through ICMP, and routing protocols operate at the internet layer.

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