Computer Knowledge

Computer Networks

2,095 Questions

Computer networks form the backbone of digital communication, connecting multiple devices to share data and resources. This area covers network architectures, transmission media, modems, and topologies like LAN. These concepts are crucial for computer knowledge sections in banking and government exams.

Network topologiesModulation and demodulationNetwork addressingFiber optic cablesWireless infrastructure

Computer Networks Questions

Multiple choice technology platforms and products

Physical connections can be created in

  1. Topology manager

  2. security manager

  3. designer

  4. non of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Oracle Data Integrator (ODI), physical connections, physical schemas, and data servers are defined and managed within the Topology Manager. Security manager handles users, and Designer handles projects and mappings.

Multiple choice technology

Which are right, option regarding the Switch Stage?

  1. It can have n number of input and n number of output

  2. It can have 1 input link and 128 output links

  3. It can have 1 input link and 127 output links

  4. It can have 2 input links and 127 output links
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Switch Stage in DataStage can accept only one input link but can route data to up to 128 output links based on conditional logic. This design supports complex branching scenarios where a single data stream needs to be split into multiple paths based on different conditions, making it a powerful routing tool in job designs.

Multiple choice technology architecture

Where should the infrastructure monitoring be placed within the system

  1. As close to the targets as possible

  2. anywhere within internet

  3. Within the same LAN

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Infrastructure monitoring should be as close to targets as possible to minimize network latency and false alarms. Placing monitors 'anywhere within internet' introduces variable network delays that confuse application issues with infrastructure issues. Same LAN placement is better than internet but still introduces unnecessary hops between monitor and target.

Multiple choice technology

The difference between people with access to computers and the Internet and those without this access is known as the:

  1. digital divide.

  2. Internet divide.

  3. Web divide.

  4. broadband divide.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The digital divide refers to the gap between those who have access to ICT (information and communications technology) and those who don't. This includes access to computers, internet, and digital literacy. The term specifically addresses the socioeconomic disparity in technology access, not just internet or web specifically.

Multiple choice technology security

Which type of network component typically lacks sufficient accountability controls?

  1. Workstations

  2. Servers

  3. Switches

  4. Database management systems
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Switches often lack sufficient accountability controls because they operate primarily at Layer 2 (data link layer) and typically don't have the robust logging, authentication, or individual user tracking capabilities that servers, workstations, or database management systems possess. Network switches handle packet forwarding without granular user activity monitoring, making it difficult to attribute specific actions to individual users. Workstations, servers, and DBMS typically have strong authentication and audit trails.

Multiple choice technology security

The correlation of system time among network components is important for what purpose?

  1. Availability

  2. Network connectivity

  3. Backups

  4. Audit log review
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

System time correlation is critical for audit log review because security events across multiple devices must be synchronized to reconstruct attack timelines and investigate incidents. When network components have synchronized clocks, analysts can correlate events from different sources (firewall logs, server logs, IDS alerts) to understand the sequence of actions during a security incident. Without time synchronization, logs cannot be accurately correlated, making forensic analysis nearly impossible. Availability (A), network connectivity (B), and backups (C) don't require tight time synchronization.

Multiple choice technology security

Which of the following configurations of a WLAN's SSID offers adequate security protection?

  1. Using an obscure SSID to confuse and distract an attacker

  2. Not using any SSID at all to prevent an attacker from connecting to the network

  3. Not broadcasting an SSID to make it harder to detect the WLAN

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

SSID hiding, obscuring, or not broadcasting provides no meaningful security protection as the SSID is easily discovered in management frames and traffic. These are security through obscurity measures that don't prevent unauthorized access. Real WLAN security requires WPA2/WPA3 encryption and strong authentication.

Multiple choice

Consider a source computer (S) transmitting a file of size 106 bits to a destination computer (D) over a network of two routers (R1 and R2) and three links (L1, L2, and L3). L1 connects S to R1 L2 connects R1 to R2 and L3 connects R2 to D. Let each link be of length 100 km. Assume signals travel over each line at a speed of 108 meters per second. Assume that the link bandwidth on each link is 1 Mbps. Let the file be broken down into 1000 packets each of size 1000 bits. Find the total sum of transmission and propagation delays in transmitting the file from S to D.

  1. 1005 ms

  2. 1010 ms

  3. 3000 ms

  4. 3003 ms
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Multiple choice

Assume that source S and destination D are connected through two intermediate routers labelled R. Determine how many times does each packet has to visit the network layer and the data link layer during a transmission from S to D.

  1. Network layer - 4 times and Data link layer - 4 times

  2. Network layer - 4 times and Data link layer - 3 times

  3. Network layer - 4 times and Data link layer - 6 times

  4. Network layer - 2 times and Data link layer - 6 times
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

From above given diagram, it is clearly visible that packet will visit network layer 4 times, once at each node [S, R, R, D] and it will visit Data Link layer 6 times. One time at S and one time at D, then two times for each intermediate router R as data link layer is used for link-to-link communication. Once a packet reaches R and goes up from physical-DL-Network and second time when packet comes out of router in the order Network-DL-Physical.