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D1.C6.NetServ
Network Services
Question | Answer |
---|---|
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 |
What three items are contained in an Ethernet header and trailer? ** | -source MAC address -destination MAC address -Error-checking information |
Which protocols are TCP/IP application layer protocols? ** | -FTP (FIle Transfer Protocol) -SMTP |
Which protocol is used to access a website? ** | HTTP |
What is an advantage of the use of layers in the OSI reference model? ** | It prevents changes in one layer from affecting other layers. |
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 |
Whenever e-mail clients send letters, what device is used to translate the domain names into their associated IP address? ** | DNS server |
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. |
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. |
Which port number is used by SMTP? ** | 25 |
Which application is most likely used to translate www.cisco.com to 198.133.219.25? ** | DNS |
Which of the following are layers of the TCI/IP model? ** | -Application -Internet -Network Acces |
Which protocol is used by e-mail servers to communicate with each other? ** | SMTP |
What client software enables logged in users to communicate with other logged in users in real time? ** | Instant messaging |
What type of server would use IMAP? ** | |
What resolves a website URL to and IP adress? ** | DNS server |
What information is contains in an IP header? ** | Source and destination IP address |
Which protocol is used by FTP to transfer files over the Internet? ** | TCP |
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 |
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 |
Cabling issues are associated with which OSI layer? ** | 1 |
A network client in a corporate environment reboots. Which type of server would most likely be used first? ** | DNS |
DHCP | Service that assigns IP address, subnet mask, default gateway and other information to clients. |
IP | Specifies how data is encapsulated into packets and the logical addressing. |
DNS | Service that provides the IP address of a web site URL or domain name so a host can connect to it. |
DNS port number | 53 |
FTP | Service that allows for download and upload of files between client and server. |
FTP port number | 20 |
E-Mail server | Service that sends, receives and stores mail in user mailboxes located on the server. |
SMTP (Simple Mail Transfer Protocol) | To send mail |
POP3 (Post Office Protocol) | To retrieve mail |
IMAP4 | To retrieve mail |
POP3 port number | 110 |
SNMP port number | 161 |
Web server | User types in a URL and a page loads in the client browser. |
HTTP port number | 80 |
HTTPS port number | 443 |
HTTP | protocol commonly used by a web browser |
HTTPS | Secure protocol |
Web Client | Requests a web page |
Telnet port number | 23 |
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. |
IP Telephony | Uses peer to peer technology |
VoIP (Voice over IP) | Uses IP packets to carry digitized voice as data. |
Application Layer of the OSI model | FTP, POP3, DHCP |