Quiz 2

The number of objects in a Web page which consists of 4 jpeg images and HTML text is ________

- 5 - 4 jpeg images + 1 base HTML file.

The values GET, POST, HEAD etc are specified in ____________ of HTTP message

- Request line - It is specified in the method field of request line in the HTTP request message.

The first line of HTTP request message is called _____________

- request line - The line followed by request line are called header lines and status line is the initial part of response message.

In the process of fetching a web page from a server the HTTP request/response takes __________ RTTs.

1

Find the oddly matched HTTP status codes

304 Not Found

What is point-to-point protocol?

A communications protocol used to connect computers to remote networking services including Internet service providers.

What is subnet?

A generic term for section of a large networks usually separated by a bridge or router.

What is the difference between ARP and RARP?

ARP - Address resolution protocol is used to associate the 32-bit IP address with the 48-bit physical address, used by a host or a router to find the physical address of another host on its network by sending a ARP query packet that includes the IP address of the receiver. RARP - Reverse address resolution protocol allows a host to discover its Internet address when it knows only its physical address.

Compare analog and digital signals?

Analog signals can have an infinite number of values in a range but digital signal can have only a limited number of values.

What are the duties of data link layer?

Data link layer is responsible for carrying packets from one hop (computer or router) to the next. The duties of data link layer include packetizing, addressing, error control, flow control, medium access control.

Define bit rate and bit interval?

Digital signals are aperiodic.so instead of using period and frequency we use bit interval and bit rate respectively. Bit interval is the time required to send one single bit. Bit rate is the number of bit intervals per second.

The __________ method when used in the method field, leaves entity body empty.

GET

The HTTP response message leaves out the requested object when ____________ method is used

HEAD

When displaying a web page, the application layer uses the

HTTP protocol

Which of the following is present in both an HTTP request line and a status line?

HTTP version number

The conditional GET mechanism

Helps to keep a cache up to date

What is multipoint connection?

In multipoint connection more than two specific devices share a single link. Here the capacity of the channel is shared either separately or temporally.

What do you mean by switching?

It is a method in which communication devices are connected to one another efficiently. A switch is intermediary hardware or software that links devices together temporarily. Switching in data communication is of three types - Circuit switching - Packet switching - Message switching

What is a network?

It is a set of devices connected by communication links. A node can be a computer or any other device capable of sending and/or receiving data generated by other nodes on the network.

What is a protocol?

It is a set of rules that governs data communication.

What is distributed processing?

It is a strategy in which services provided by the network reside at multiple sites.

What is a Firewall?

It is an electronic down bridge which is used to enhance the security of a network. Its configuration has two components. 1) Two routers 2)Application gateway

What do you mean by data communication?

It is the exchange of data between two devices via some form of transmission medium such as wire cable. The communicating system must be part of a communication system made up of a combination of hardware and software. The effectiveness of a data communication system depends on three fundamental characteristics: delivery, accuracy and timeliness.

What is Hypertext Transfer Protocol (HTTP)?

It is the main protocol used to access data on the World Wide Web. This protocol transfers data in the form of plain text, hypertext, audio, video, and so on. It is so called because its efficiency allows its use in a hypertext environment where there are rapid jumps from one document to another.

What is full duplex?

It is the mode of communication between two devices in which flow of data is bidirectional and it occurs simultaneously. Here signals going in either direction share the capacity of the link.

What is half-duplex?

It is the mode of communication between two devices in which flow of data is bidirectional but not at the same time. ie each station can transmit and receive but not at the same time.

What is simplex?

It is the mode of communication between two devices in which flow of data is unidirectional.

What is point to point connection?

It provides a dedicated link between two devices. The entire capacity of the link is reserved for transmission between the two devices.

What is multiplexing?

Multiplexing is the process of dividing a link, the physical medium, into logical channels for better efficiency. Here medium is not changed but it has several channels instead of one.

The default connection type used by HTTP is _________

Persistent

The time taken by a packet to travel from client to server and then back to the client is called __________

RTT : round trip time

What is multicast routing?

Sending a message to a group is called multicasting, and its routing algorithm is called multicast routing.

What do you mean by subnetting?

Subnetting divides one large network into several smaller ones. It adds an intermediate level of hierarchy in IP addressing.

What is TELNET?

TELNET is a client - server application that allows a user to log on to a remote machine, giving the user access to the remote system. TELNET is an abbreviation of terminal network.

What is Redundancy?

The concept of including extra information in the transmission solely for the purpose of comparison. This technique is called redundancy.

What is IP address?

The internet address (IP address) is 32bits that uniquely and universally defines a host or router on the internet. The portion of the IP address that identifies the network is called netid. The portion of the IP address that identifies the host or router on the network is called hostid.

Define bandwidth?

The range of frequencies that a medium can pass is called bandwidth. It is the difference between the highest and lowest frequencies that the medium can satisfactorily pass.

What is a topology?

Topology of a network is defined as the geometric representation of the relationship of all the links and linking devices (node) to one another .

What is virtual channel?

Virtual channel is normally a connection from one source to one destination, although multicast connections are also permitted. The other name for virtual channel is virtual circuit.

Which of the following is not correct?

Web cache doesn't have its own disk space

What is World Wide Web?

World Wide Web is a repository of information spread all over the world and linked together. It is a unique combination of flexibility, portability, and user- friendly features. The World Wide Web today is a distributed client-server service, in which a client using a browser can access a service using a server. The service provided is distributed over many locations called web sites.

HTTP is ________ protocol.

application layer

In HTTP pipelining

multiple HTTP requests are sent on a single TCP connection without waiting for the corresponding responses

Multiple object can be sent over a TCP connection between client and server in

persistent HTTP

The HTTP request message is sent in _________ part of three-way handshake.

third

HTTP client requests by establishing a __________ connection to a particular port on the server.

transmission control protocol

In the network HTTP resources are located by

uniform resource identifier