Vital Cable Tester Interview Preparation Guide

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This type of connection gives continuous high-speed internet. In this type, if we log off from the internet for any reason then there is no need to log in again.

☛ Syntax: It is the format of the data. That means in which order the data is displayed.
☛ Semantics: Describes the meaning of the bits in each section.
☛ Timing: At what time the data is to be sent and how fast it is to be sent.

In data transmission if the sender sends any data frame to the receiver then the receiver should send the acknowledgment to the sender. The receiver will temporarily delay (waits for the network layer to send the next data packet) the acknowledgment and hooks it to the next outgoing data frame, this process is called as Piggybacking

A set of instructions or rules or guidelines that are used in establishing communications between computers of a network is called as Protocol.

HTTPS is a Secure HTTP. HTTPS is used for secure communication over a computer network. HTTPS provides authentication of websites which prevents unwanted attacks.

In a bi-directional communication, HTTPS protocol encrypts the communication so that tampering of the data gets avoided. With the help of a SSL certificate, it verifies if the requested server connection is a valid connection or not. HTTPS uses TCP with port 443.

In a Mesh Topology, each device of the network is connected to all other devices of the network. Mesh Topology uses Routing and Flooding techniques for data transmission.

The advantage of mesh topology is if one link breaks then it does not affect the whole network. And the disadvantage is, huge cabling is required and it is expensive.

In a computer network, to enable data transmission from one computer to another, the network devices send messages in the form of packets. These packets are then added with the IP header by OSI reference model layer.

The Data Link Layer encapsulates each packet in a frame which contains the hardware address of the source and the destination computer. If a destination computer is on the remote network then the frames are routed through a gateway or router to the destination computer.

In Star Topology, there is a central controller or hub to which every node or device is connected through a cable. In this topology, the devices are not linked to each other. If a device needs to communicate with the other, then it has to send the signal or data to the central hub. And then the hub sends the same data to the destination device.

The advantage of the star topology is that if a link breaks then only that particular link is affected. The whole network remains undisturbed. The main disadvantage of the star topology is that all the devices of the network are dependent on a single point (hub). If the central hub gets failed, then the whole network gets down.

It is a powerful network type than LAN. The area covered by MAN is a small town, city etc. A huge server is used to cover such a large span of area for connection.

HTTP is HyperText Transfer Protocol and it is responsible for web content. Many web pages are using HTTP to transmit the web content and allow the display and navigation of HyperText.

It is the primary protocol and port used here is TCP port 80.

When two or more computers are connected together to share resources without the use of a central server is termed as a peer-to-peer network. Computers in this type of network act as both server and client. Generally used in small companies as they are not expensive.

When a piece of information or a packet is sent from a particular source to a specified destination then it is called as Unicasting.

Access VPN’s provides connectivity to the mobile users and telecommuters. It is an alternative option for dial-up connections or ISDN connections. It provides low-cost solutions and a wide range of connectivity.

It receives the data from the Application Layer which is above Transport Layer. It acts as a backbone between the host’s system connected with each other and it mainly concerns about the transmission of data. TCP and UDP are mainly used as a Transport Layer protocols.

It is a smallest and basic network type that is often used at home. It is a connection between the computer and another device such as phone, printer, modem tablets etc

Sending the datagrams from a source to the nearest device among the group of servers which provide the same service as the source is termed as Anycasting.

It is a wireless internet connection between the devices. It uses radio waves to connect to the devices or gadgets.

The terminologies Internet, Intranet, and Extranet are used to define how the applications in the network can be accessed. They use similar TCP/IP technology but differ in terms of access levels for each user inside the network and outside the network.

Internet: Applications are accessed by anyone from any location using the web.

Intranet: It allows limited access to the users in the same organization.

Extranet: External users are allowed or provided with access to use the network application of the organization.

The router is a network device which connects two or more network segments. The router is used to transfer information from the source to destination.

Routers send the information in terms of data packets and when these data packets are forwarded from one router to another router then the router reads the network address in the packets and identifies the destination network.

They are useful for connecting remote offices using shared infrastructure with the same policy as a private network.

The design and construction of a network are termed as networking.

Sending a packet to each device of the network is termed as broadcasting.

IDEA stands for International Data Encryption Algorithm.

This is nothing but the medium used by the computers for communication.

The router is nothing but a switch which processes the signal/traffic using routing protocols.