Network Services
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What is the correct order of the layers of the OSI reference model, starting at the lowest layer and working up the model? ** | Physical, Data Link, Network, Transport, Session, Presentation, Application
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| What three items are contained in an Ethernet header and trailer? ** | -source MAC address
-destination MAC address
-Error-checking information
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| Which protocols are TCP/IP application layer protocols? ** | -FTP (FIle Transfer Protocol)
-SMTP
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| Which protocol is used to access a website? ** | HTTP
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| What is an advantage of the use of layers in the OSI reference model? ** | It prevents changes in one layer from affecting other layers.
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| What term is used to describe how TCP/IP protocols are layered and interact to format, address, and transmit information across a network? ** | Protocol stack
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| Whenever e-mail clients send letters, what device is used to translate the domain names into their associated IP address? ** | DNS server
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| An Internet is server running both FTP and HTTP services. How does the server know which of these application should handle an incoming segment? ** | The segment destination port number identifies the application that should handle it.
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| You are creating a network-based video game. What influences your decision about which transport protocol to use for the application? ** | UDP will not disrupt the game to retransmit dropped packets.
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| Which port number is used by SMTP? ** | 25
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| Which application is most likely used to translate www.cisco.com to 198.133.219.25? ** | DNS
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| Which of the following are layers of the TCI/IP model? ** | -Application
-Internet
-Network Acces
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| Which protocol is used by e-mail servers to communicate with each other? ** | SMTP
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| What client software enables logged in users to communicate with other logged in users in real time? ** | Instant messaging
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| What type of server would use IMAP? ** | E-mail
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| What resolves a website URL to and IP adress? ** | DNS server
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| What information is contains in an IP header? ** | Source and destination IP address
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| Which protocol is used by FTP to transfer files over the Internet? ** | TCP
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| A client has decoded a frame and started the de-encapsulation process. In which order does the de-encapsulation process occur? ** | Remove Ethernet header and trailer
Remove IP header
Remove TCP header
Pass data to the application
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| A device receives an Ethernet fame and recognizes the MAC address as its own. What does the device do to the message to get the encapsulated data? ** | Removes the Ethernet header and trailer
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| Cabling issues are associated with which OSI layer? ** | 1
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| A network client in a corporate environment reboots. Which type of server would most likely be used first? ** | DNS
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| DHCP | Service that assigns IP address, subnet mask, default gateway and other information to clients.
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| IP | Specifies how data is encapsulated into packets and the logical addressing.
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| DNS | Service that provides the IP address of a web site URL or domain name so a host can connect to it.
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| DNS port number | 53
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| FTP | Service that allows for download and upload of files between client and server.
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| FTP port number | 20
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| E-Mail server | Service that sends, receives and stores mail in user mailboxes located on the server.
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| SMTP (Simple Mail Transfer Protocol) | To send mail
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| POP3 (Post Office Protocol) | To retrieve mail
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| IMAP4 | To retrieve mail
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| POP3 port number | 110
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| SNMP port number | 161
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| Web server | User types in a URL and a page loads in the client browser.
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| HTTP port number | 80
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| HTTPS port number | 443
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| HTTP | protocol commonly used by a web browser
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| HTTPS | Secure protocol
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| Web Client | Requests a web page
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| Telnet port number | 23
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| Telnet | service that allows administrators to log in to a host from a remote location and control the host as though they were logged in logically.
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| IP Telephony | Uses peer to peer technology
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| VoIP (Voice over IP) | Uses IP packets to carry digitized voice as data.
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| Application Layer of the OSI model | FTP, POP3, DHCP
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