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Ch 14 Networking and Internetworking
Unix The Textbook 2nd Edition
55
Computer Science
Undergraduate 2
11/17/2014

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Term
The distance between hosts is in the range of tens of kilometers to a few thousand kilometers
Definition
Wide Area Networks(WAN)
Term
The distance between hosts is in the range of one to 20 kilometers
Definition
Metropolitan Area Networks(MAN)
Term
The distance between hosts is in the range of a few meters to about one kilometer
Definition
Local Area Network(LAN)
Term
When two or more computer hardware resources are connected they form a ?
Definition
computer network
Term
In a ___ the are connected to each other via specialized computers called routers or gateways. It is a network of networks.
Definition
internetwork
Term
Routers that connect more than two networks are known as ?
Definition
multi-port routers
Term
Name the reasons for using networks of computers
Definition
1. Sharing of computer resources
2. Network is an inexpensive, fast, and reliable communications medium.
3. It is cost efficient.
4. Less performance degradation.
Term
The two best known network models are ?
Definition
1. International Standard's Organization's Open System Interconnect Reference Model (ISO's OSI 7-layer reference model
2. TCP/IP 5 layer model
Term
Name the 5 layers of the TCP/IP model
Definition
5. Application
4. Transport
3. Network
2. Link
1. Device/Physical
Term
Name the 7 layers of the ISO 7-layer Reference Model
Definition
7. Application
6. Presentation
5. Session
4. Transport
3. Network
2. Data link
1. Physical
Term
What protocols are associated with the Device/Physical layer
Definition
Device/Physical
Term
What protocols are associated with the Link layer
Definition
ARP, RARP, Ethernet, Token rign, ATM, etc
Term
What protocols are associated with the Network layer
Definition
IPv4, IPv6, ICMP, IGMP
Term
What protocols are associated with the Transport layer
Definition
TCP, raw sockets, UDP
Term
What protocols are associated with the Application layer
Definition
http, telnet, smtp, ftp, traceroute, ping, time, daytime, e-mail, web browser.
Term
What is the purpose of the transport layer
Definition
to transport application data from one machine to a remote machine and vice versa
Term
the best effort delivery service is offered by what Transport protocol
Definition
User Datagram Protocol
Term
The completely reliable in-sequence delivery is offered by which Transport layer protocol
Definition
Transmission Control Protocol
Term
a data packet transported by TCP is called a ?
Definition
segment
Term
a data packet transported by UDP is called a ?
Definition
datagram
Term
TCP and UDP protocols identify every process running on a host by a 16-bit positive integer called ?
Definition
port numbers
Term
The network protocol responsible for routing application data to the destination host is ?
Definition
Internet Protocol (IP) which uses a connectionless routing algorithm
Term
Applications that need guaranteed delivery use which network protocol as their transport level protocol
Definition
Transport Control Protocol (TCP)
Term
The key to routing is the __ __ of a unique identification to every host on the Internet.
Definition
IP assignment, which IP does by uniquely identifying the network it is on and then uniquely identifying the host on that network.
Term
In IPV4, the address is divided into what three fields
Definition
address class which identifies the class of the address, the network ID and host ID.
Term
IPV4 address class
Definition
A 0.0.0.0 -127.255.255.255
B 128.0.0.0 -192.255.255.255
C 192.0.0.0 -233.255.255.255
Term
Symbolic names have the format __.__
Definition
hostname.domain_name
Term
The symbolic name referring to the site and is assigned by various registrars whose list is maintained by Internet's Network Information Center.
Definition
domain_name
Term
It is assigned and controlled by the site that is allocated the domain_name.
Definition
hostname
Term
The right-most string in a domain name is called ?
Definition
top-level domain
Term
The string to the left of the right-most period identifies an ?
Definition
organization
Term
Attaching the name of a host to a domain name with a period between them yields the ?
Definition
fully qualified domain name (FQDN)
Term
This service implements a distributed database of name-address mappings.
Definition
Domain Name System
Term
Use this command to view the IP address and other information about your host's interface to the network
Definition
ifconfig -a
Term
This command allows you to display IP address(es) for a domain name or vice versa
Definition
host
Term
This command allows you to interact with DNS servers and display their responses to queries
Definition
dig [options]
-p port interact with a name server at 'port' instead of the default port 53
Term
If a server accepts a client request, the client and server are said to be connected through a ?
Definition
virtual connection
Term
When you want to view the Web page of a site, you give the site's __ to the client process.
Definition
Universal Resource Locator
Term
A client software that can invoke client programs for most Internet services by specifying a domain name or IP address, as well as the port number of the host on which a server runs is known as a ?
Definition
fully parameterized client.
Term
Display information about the users currently using machines on your network.
Definition
who
Term
Command to display the names of the users logged on to the machines on your local network.
Definition
users
Term
Command to show status of machines on the local area network
Definition
uptime [options]
Term
Command to test the status of a network of a particular host.
Definition
ping
Term
Command to display information about the users on a local or remote host
Definition
finger [options] user-list
Term
Command to allow you to connect to a remote computer over a network
Definition
telnet [options][host[port]]
Term
Command that allows you to log on to a host on your local network.
Definition
login [options] host
Term
Command to execute a command on remote host on your local network.
Definition
rsh [options] command
Term
Command to transfer files from or to a remote host
Definition
ftp [options] host
Term
Command to copy files to and from a remote machine on the same LAN, without logging on to the remote host.
Definition
remote copy
rcp [options] [host:]sfile [host:]dfile
-r recursively copy files at sfile to dfile
-p preserve file modify and access times
The name of your local host must be in tehe /etc/hosts.equiv file on the remote machine for it to be a trusted host
Term
This command allows you to perform the same tasks that you can perform with the rlogin and rsh commands, but in a more secure mannter.
Definition
secure shell or ssh
Term
Security feature to authenticate a user and its host before allowing the user to log in to the remote machine.
Definition
public-key cryptography
Term
This command is the secure version of the rcp command. It means that copying takes place under encrypted sessions after proper authentication of the local host and user.
Definition
scp
Term
This command is the secure version of the ftp command. It works just like the ftp command, except that stronger authentication takes place before file transfer takes place, and transfer takes place in encrypted session.
Definition
sftp
Term
The command to initiate interactive communcation with 'user' who is logged in on a 'tty' terminal.
Definition
talk user [tty]
Term
The command to display the route(the names of the routers in the path) that your e-mail messages, telnet commands, and downloaded files from an ftp site can take from yuour host to the remote and vice versa.
Definition
traceroute remote_host
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