CCNA 1 v6.0 Chapter 10: Application Layer: Check your Understanding Answers
1. The TCP/IP application layer effectively consists of which three OSI layers?
- Application, session, transport
- Application, presentation, session
- Application, transport, network
- Application, network, data link
Explanation: The functionality of the TCP/IP application layer protocols fit roughly into the framework of the top three layers of the OSI model: application, presentation, and session.
2. What main protocols do email users and servers normally use to process email? (Choose three.)
- DHCP
- SMTP
- IMAP4
- DNS
- POP3
Explanation: Email supports three separate protocols for operation: Simple Mail Transfer Protocol (SMTP), Post Office Protocol (POP), and Internet Message Access Protocol (IMAP).
3. DHCP enables clients on a network to do which of the following?
- Have unlimited telephone conversations
- Play back video streams
- Obtain IP addresses
- Track intermittent denial of service attacks
Explanation: DHCP allows a host to obtain an IP address dynamically when it connects to the network.
4. What TCP/IP layer supports the exchange of data between programs running on the source and destination hosts?
- Application
- Transport
- Internetwork
- Network
Explanation: Application layer protocols are used to exchange data between programs running on the source and destination hosts.
5. What is the purpose of DNS?
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The Domain Name System (DNS) provides domain name to address resolution for networks allowing end users to access resources with names rather than more difficult to remember IP addresses. This automated service matches resource names with the required numeric network addresses.