Networking Miscellaneous — Part 1 MCQs with Explanations

A. Simplex: Simplex communication is a method of communication where transmission occurs in only one direction. It does not support two-way communication. B. Four wire circuit: A four-wire circuit refers to a communication channel that uses separate wires for transmission and reception, allowing for simultaneous two-way communication. However, this option does not describe the scenario where only one direction is allowed at a time. C. Full Duplex: Full duplex communication is a method where transmission can occur simultaneously in both directions. It allows for two-way communication simultaneously, which is not the case in the given scenario. D. Half Duplex: Half duplex communication is the correct answer. In this method, transmission can take place in both directions, but only one direction can occur at a time. The communication switches between the two directions, allowing communication in both directions but not simultaneously. Therefore, the correct answer is: D. Half Duplex

Mess Topology is a network setup where each computer and network device is interconnected with one another, allowing for most transmissions to be distributed, even if one of the connections go down. This topology is not commonly used for most computer networks as it is difficult and expensive to have redundant connection to every computer. However, this topology is commonly used for wireless networks.

Start and stop bits are not needed in synchronous transfer of data. So, it is 2400/8=300.

As all lines are full-duplex and there are no self connections, only the cross points above the diagonals are needed. Hence formula for the number of cross points required is n(n-1)/2.

Since there are six 1200bps terminals, 6*1200 + n*300 =9600 by solving this, n=8.

Maximum data rate = 2 H log 2 V bps, where H is the bandwidth, V is the discrete levels. Here H is 3 kHz and V is 2. So, data rate = 2*3000 log 2 2 bps = 6000 bps.

A mesh network is a local area network topology in which the infrastructure nodes connect directly, dynamically and non-hierarchically to as many other nodes as possible and cooperate with one another to efficiently route data to and from clients.

Data communications means the exchange of data between two devices via some form of transmission medium such as a wire cable. For data communications to occur, the communicating devices must be part of a communication system made up of a combination of hardware (physical equipment) and software (programs). The effectiveness of a data communications system depends on four fundamental characteristics: delivery, accuracy, timeliness, and jitter. 1. Delivery: The system must deliver data to the correct destination. Data must be received by the intended device or user and only by that device or user. 2. Accuracy: The system must deliver the data accurately. Data that have been altered in transmission and left uncorrected are unusable. 3. Timeliness: The system must deliver data in a timely manner. Data delivered late are useless. In the case of video and audio, timely delivery means delivering data as they are produced, in the same order that they are produced, and without significant delay. This kind of delivery is called real-time transmission. 4. Jitter: Jitter refers to the variation in the packet arrival time. It is the uneven delay in the delivery of audio or video packets. For example, let us assume that video packets are sent every 3D ms. If some of the packets arrive with 3D-ms delay and others with 4D-ms delay, an uneven quality in the video is the result.

Unguided Media: Unguided media refer to the transmission media that do not require any physical conductor or wire. These are primarily used for wireless communication. There are three main types of unguided media: 1. Radio waves: These are used for long-range communication like broadcasting and mobile communication. 2. Microwaves: These are used for point-to-point communication and satellite communications. 3. Infrared: This is used for short-range communication, such as remote controls and wireless data transfers. Therefore, the correct answer is Option D: 3 types of unguided media in network communication.

IPV4 (Internet Protocol version 4) is a connectionless protocol used in packet-switching networks. It is the most widely used version of the Internet Protocol. IPV4 uses the Datagram approach, where data is divided into small packets, each packet is individually routed to its destination, and packets can take different paths to reach the destination. The packets are then reassembled at the destination to form the complete data. IPV5 and IPV6 are also Internet Protocol versions, but they are not specifically known for being connectionless or using the Datagram approach. Therefore, option B, IPV4, is the correct choice in this context.

Twisted-pair wire has the slowest transmission speeds among the given options. It is commonly used in telephone networks and older data communication networks. Coaxial cable has higher transmission speeds compared to twisted-pair wire and is used in cable TV and internet services. Fiber-optic cable offers the highest transmission speeds as it uses light to transmit data. Microwaves are used for wireless transmission and offer higher speeds compared to twisted-pair wire.

To divide the network into multiple subnets and ensure at least 600 host IDs are available per subnet, we need to calculate the appropriate subnet mask that maximizes the number of subnets while satisfying the requirement of at least 600 hosts per subnet. Step 1: Required Host IDs At least 600 host IDs are needed for each subnet. To calculate the required number of bits, we use the formula: 2 h - 2 ≥ 600 , where "h" is the number of host bits. 2 10 - 2 = 1024 - 2 = 1022 host addresses, which is more than enough for 600 hosts. Step 2: Subnet Mask Calculation The default subnet mask for a Class B address (134.57.0.0) is 255.255.0.0. To satisfy the 600 host requirement, 10 bits must be reserved for hosts. The remaining bits (16 - 10 = 6) can be used for subnetting. This gives us a subnet mask of 255.255.248.0 , which allows for 1024 hosts per subnet, fulfilling the requirement. Step 3: Evaluating Other Options Option A: 255.255.224.0 provides 8190 hosts per subnet, which is more than needed, but results in fewer subnets. Option B: 255.255.240.0 provides 4094 hosts per subnet, which also exceeds the requirement but limits the number of subnets. Option D: 255.255.255.0 provides only 254 hosts per subnet, which is insufficient for the requirement of at least 600 hosts. Option E: 255.255.255.255 is not valid as a subnet mask for this purpose as it only allows 1 host. Conclusion: The correct answer is Option C: 255.255.248.0 , as it provides the largest number of subnets while allowing at least 600 host IDs per subnet.

End-to-end connectivity is provided from host-to-host in the Transport layer . The Transport layer is responsible for ensuring reliable data transmission between the source and destination hosts. It establishes a logical connection between the sender and receiver, manages data flow control, error detection and correction, and sequencing of data packets. By providing end-to-end connectivity, the Transport layer ensures that data can travel from the source host to the destination host reliably and efficiently. Therefore, the correct answer is Option D: Transport layer.

Cyclic Redundancy Code is the correct answer to “Error detection at the data link level is achieved by”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

X.25 level 2-ISO is the correct answer to “Which of the following is a wrong example of network layer”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

The rate at which the signal changes. is the correct answer to “"BAUD" rate means”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Synchronization is the correct answer to “Start and stop bits are used in serial communication for”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Baseband signal is the correct answer to “Unmodulated signal coming from a transmitter is know as”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

ARPANET is the correct answer to “Which one of the following network uses dynamic or adaptive routing”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Residual Error Rate. is the correct answer to “The ________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Capability Data is the correct answer to “In session layer, during data transfer, the data stream responsible for the "control" purpose (i.e control of the session layer itself) is”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

E-mail is the correct answer to “A high speed communication equipment typically would not be needed for”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Data Link is the correct answer to “Which of the following ISO level is more closely related to the physical communications facilities”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Pin-code is the correct answer to “which of the following is not a field in the Ethernet Message packet”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Half Duplex is the correct answer to “In a broad Sense, a railway track is an example of”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

PAN is the correct answer to “Which network has connectivity range up to 10 meters”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Represents symbol or characters used in any langua is the correct answer to “What is Unicode”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Hardware and software is the correct answer to “For data communications to occur, the communicating devices must be part of a communication system made up of a combination of”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Both stations can transmit and receive data at the is the correct answer to “Correct method for full duplex mode of communication is:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

5 components is the correct answer to “A data communications system has:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Black pixel is the correct answer to “00 represents a pixel that pixel is known as :”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Multi-point is the correct answer to “Select correct type of line configuration:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Transits is the correct answer to “Select the wrong data communication system component:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Transit time is the correct answer to “Time required for a message to travel from one device to another is known as:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Star topology is the correct answer to “If one link fails, only that link is affected. All other links remain active. Which topology does this”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Open systems interconnection is the correct answer to “OSI model means:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Fiber optic cable is the correct answer to “Select the correct cable that transport signals in the form of light:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Wired Media is the correct answer to “Twisted pair wires, coaxial cable, optical fiber cables are the examples of:”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

Twisted-pair cable is the correct answer to “Which of the followings is used in communications is referred to as unshielded twisted-pair (UTP)”. This question is standard in competitive examination syllabi for Networking Miscellaneous.

A typical optical fiber consists of a very narrow is the correct answer to “What is Cladding”. This question is standard in competitive examination syllabi for Networking Miscellaneous.