1. A new employee is attempting to configure a cell phone to connect to the email server of the company. Which port number should be selected when using the POP3 protocol to access messages stored on the email server?
- 25
- 143
- 110
- 69
Explanation: The POP3 protocol uses the TCP protocol with port 110 for accessing emails stored on a local server.
2. What is the advantage of using SSH over Telnet?
- SSH provides secure communications to access hosts.
- SSH operates faster than Telnet.
- SSH is easier to use.
- 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.
3. Which protocol retains a message in a mailbox on a server, even after the message is accessed by a user on a local client device?
- POP3
- DNS
- SMTP
- IMAP4
Explanation: The IMAP4 protocol will keep any message accessed by a client device in the mailbox on the server. The message is removed from the mailbox only after it is deleted by a user on the client device.
4. A new employee is attempting to configure a cell phone to connect to the email server of the company. Which port number should be selected when using the IMAP4 protocol to access email messages stored on the local server?
- 25
- 143
- 110
- 69
Explanation: The IMAP4 protocol uses the TCP protocol with port 143 for accessing emails stored on a local server.
5. Which protocol is used to transfer web pages from a server to a client device?
- SMTP
- SSH
- POP
- HTTP
- HTML
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.
6. A new employee is configuring a cell phone for company email. Once configured, what is the destination port number used when the employee sends an email from the phone?
- 23
- 110
- 25
- 143
Explanation: The SMTP protocol uses TCP port 25 as the destination when a client is sending an email message using a local server.
7. Refer to the exhibit. Which protocol allows a user to type www.cisco.com instead of an IP address to access the web server?
- HTTP
- FTP
- HTML
- SNMP
- DNS
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.
8. Which communication tool allows multiple users to communicate with each other in real time by using a smartphone application or social media site?
- blog
- web mail
- instant messaging
Explanation: Instant messaging (IM) software enables users to communicate or chat over the Internet in real time. IM requires users to log in before they can communicate. Blogs, email, and web mail are asynchronous communication tools.
9. An employee of a company is attempting to remotely access a computer system using a virtual terminal (vty) session via Telnet. Which destination port number should the employee put in the remote access software being used?
- 20
- 23
- 69
- 110
Explanation: A Telnet server listens on TCP port 23.
10. What two characteristics describe an FTP connection? (Choose two.)
- Files can be downloaded from or uploaded to the server.
- The server establishes the first connection with the client to control traffic that consists of server commands and client replies.
- The first connection established is for traffic control and the second connection is created to transfer a file.
- The client needs to run a daemon program to establish an FTP connection with a server.
- A large file requires more than two connections between the client and the server to successfully download it.
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.
11. Which protocol is used by web servers to serve up a web page?
- FTP
- IMAP
- POP
- HTTP
Explanation: Hypertext Transfer Protocol (HTTP) is a protocol that is used by web servers to serve up a web page.
12. Which protocol removes messages from the server after they have been accessed by a client?
- SMTP
- POP3
- IMAP4
- DNS
Explanation: The POP3 email protocol will download messages off a server as the client accesses them. By default, these messages will not be kept on the server once they have been accessed by a client.
13. When analog voice signals are converted for use on a computer network, in what format are they encapsulated?
- frames
- segments
- IP packets
- bits
Explanation: When Voice over iP (VoIP) is being used, analog voice signals are translated into digital data in the form of IP packets. This translation allows the phone call to be carried through a computer network.