16.8.3 Application Layer Services Quiz Answers. Networking Basics Module 16 quiz exam answers
1. What two characteristics describe an FTP connection? (Choose two.)
- A large file requires more than two connections between the client and the server to successfully download it.
- The server establishes the first connection with the client to control traffic that consists of server commands and client replies.
- Files can be downloaded from or uploaded to the server.
- The client needs to run a daemon program to establish an FTP connection with a server.
- The first connection established is for traffic control and the second connection is created to transfer a file.
Explanation: An FTP client is an application that runs on a computer used to push and pull files from a server running an FTP daemon. To transfer files, FTP requires two connections between the client and the server: one for commands and replies and another for the actual file transfer. The client establishes the first connection to the server for control traffic and the second connection for the actual file transfer. This connection is created every time there is a file to be transferred. The client can download a file from or upload a file to the server.
2. Which statement is correct about network protocols?
- Network protocols define the type of hardware that is used and how it is mounted in racks.
- They define how messages are exchanged between the source and the destination.
- They all function in the network access layer of TCP/IP.
- They are only required for exchange of messages between devices on remote networks.
Explanation: Network protocols are implemented in hardware, or software, or both. They interact with each other within different layers of a protocol stack. Protocols have nothing to do with the installation of the network equipment. Network protocols are required to exchange information between source and destination devices in both local and remote networks.
3. Which protocol is used by web servers to serve up a web page?
- FTP
- HTTP
- IMAP
- POP
Explanation: Hypertext Transfer Protocol (HTTP) is a protocol that is used by web servers to serve up a web page.
4. Match the protocol with the function. (Not all options are used.)
Explanation: Place the options in the following order:
| automatically configures hostswith IP addresses | DHCP |
| provides remote access to servers | SSH |
| resolves Interent names to IP addresses | DNS |
5. Which two protocols are used in the process of sending and receiving emails? (Choose two.)
- HTTP
- POP
- SSH
- SMTP
- FTP
Explanation: POP and SMTP are protocols used for email. POP is Post Office Protocol and is used by clients to retrieve email messages from a server. SMTP is Simple Mail Transfer Protocol and is used by clients to send email messages to a server.
6. Which two applications provide virtual terminal access to remote servers? (Choose two.)
- SSH
- DNS
- DHCP
- SMTP
- Telnet
Explanation: Telnet and SSH are two services that provide virtual terminal services to servers. DNS maps a domain name to its IP address. DHCP provides dynamic IP addressing information. SMTP provides email service.
7. What is the advantage of using SSH over Telnet?
- SSH is easier to use.
- SSH operates faster than Telnet.
- SSH provides secure communications to access hosts.
- SSH supports authentication for a connection request.
Explanation: SSH provides a secure method for remote access to hosts by encrypting network traffic between the SSH client and remote hosts. Although both Telnet and SSH request authentication before a connection is established, Telnet does not support encryption of login credentials.
8. Refer to the exhibit. Which protocol allows a user to type www.cisco.com instead of an IP address to access the web server?
- DNS
- FTP
- HTML
- HTTP
- SNMP
Explanation: Web servers are assigned static IP addresses. They are also registered with domain names so people can remember them easily. However, web servers are connected through their IP addresses. DNS provides the service to map the domain name to its IP address.
9. Which protocol is used to transfer web pages from a server to a client device?
- HTML
- SMTP
- HTTP
- SSH
- POP
Explanation: The Hypertext Transfer Protocol (HTTP) provides services between a web browser requesting web pages and a web server responding to the requests. HTML (Hypertext Markup Language) is a markup language to instruct a web browser how to interpret and display a web page.
10. Which two application layer protocols manage the exchange of messages between a client with a web browser and a remote web server? (Choose two.)
- DNS
- HTTP
- HTML
- DHCP
- HTTPS
Explanation: Hypertext Transfer Protocol (HTTP) and HTTP Secure (HTTPS) are two application layer protocols that manage the content requests from clients and the responses from the web server. HTML (Hypertext Mark-up Language) is the encoding language that describes the content and display features of a web page. DNS is for domain name to IP address resolution. DHCP manages and provides dynamic IP configurations to clients.
11. Match the port number to the email protocol.
Explanation: Place the options in the following order:
| IMAP4 | 143 |
| SMTP | 25 |
| POP3 | 110 |