Computer Knowledge

Computer Networks

2,614 Questions

Computer networks involve the architecture, protocols, and security measures used for digital communication. This collection covers OSI model layers, IP addressing, data transmission, and cryptographic standards. These concepts are vital for the computer knowledge sections of banking and government exams.

OSI model layersNetwork protocolsIP subnet maskingData encryption standardsServer configurationsNetwork commands

Computer Networks Questions

Multiple choice

What is Provider Address (PA) in Hyper-V Network Virtualization?

  1. This is the IP address that the tenant uses in their virtual networks.

  2. This address is set in the guest OS of the virtual machine as normal.

  3. This is the address that is assigned to the NIC of the virtual switch network.

  4. Both (1) and (3)

  5. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is Provider Address (PA) and this is the address that is assigned to the NIC of the virtual switch network to allow virtual machines to communicate at the physical layer.

Multiple choice

What is IP Address Rewrite in Hyper-V Network Virtualization?

  1. This is the IP address that the tenant uses in their virtual networks.

  2. This address is set in the guest OS of the virtual machine as normal. It is the only address that the tenant is normally aware of.

  3. This is the address that is assigned to the NIC of the virtual switch network.

  4. In case of every CA assigned to a VM, there is a PA assigned to the host.

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

This is known as IP Address Rewrite in Hyper-V Network Virtualization.

Multiple choice

What is Consumer Address (CA) in Hyper-V Network Virtualization?

  1. This is the IP address that the tenant uses in their virtual networks.

  2. This address is set in the guest OS of the virtual machine as normal.

  3. This is the address, which is assigned to the NIC of the virtual switch network to allow virtual machines to communicate at the physical layer.

  4. This address is not useful for virtual networks or shared networks.

  5. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

These are the correct statements about Consumer Address (CA) in Hyper-V Network Virtualization.

Multiple choice

What is the working of Network Virtualization using Generic Routing Encapsulation (NVGRE) in Hyper-V Network Virtualization?

  1. It is used to provide the connectivity for the host and the VM networks.

  2. It is based on the System Center 2012 R2.

  3. In case of every CA assigned to a VM, there is a PA assigned to the host.

  4. This is the address that is assigned to the NIC of the virtual switch network to allow virtual machines to communicate at the physical layer.

  5. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

These are correct about NVGRE in Hyper-V Network Virtualization.

Multiple choice

What does NAT mean in Virtual Machines (VMs) when abstracted networks communicate with the world via. their NVGRE encapsulated networking?

  1. It provides the some networking services to the users on VMs.

  2. It is used to provide the better data access for the subnets, routers and other networks.

  3. It uses BGP provided by the appliance to allow tenants to integrate their on-premise networks with networks in a hosted private or public cloud.

  4. The hosting company can route (probably via firewall) onto the VM subnets to provide additional management functionality.

  5. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

These are correct statements about NAT.

Multiple choice

A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT

  1. block entire HTTP traffic during 9:00 PM and 5:00 AM

  2. block all ICMP traffic

  3. stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address

  4. block TCP traffic from a specific user on a multi-user system during 9:00 PM and 5:00 AM
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since it is a layer 4 firewall, it cannot block application layer protocol like HTTP.

Multiple choice

Consider different activities related to email. m1: Send an email from a mail client to a mail server m2: Download an email from mailbox server to a mail client m3: Checking email in a web browser Which is the application level protocol used in each activity?

  1. m1: HTTP m2:SMTP m3:POP

  2. m1: SMTP m2:FTP m3:HTTP

  3. m1: SMTP m2: POP m3: HTTP

  4. m1: POP m2: SMTP m3:IMAP
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sending an email will be done through user agent and message transfer agent by SMTP, downloading an email from mail box is done through POP, checking email in a web browser is done through HTTP.

Multiple choice

An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20. The ISP wants to give half of this chunk of addresses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of address to A and B?

  1. 245.248.136.0/21 and 245.248.128.0/22

  2. 245.248.128.0/21 and 245.248.128.0/22

  3. 245.248.132.0/22 and 245.248.132.0/21

  4. 245.248.136.0/24 and 245.248.132.0/21
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since half of 4096 host addresses must be given to organization A, we can set 12th bit to 1 and include that bit into network part of organization A, so the valid allocation of addresses to A is 245.248.136.0/21 Now for organization B, 12th bit is set to '0' but since we need only half of 2048 addresses, 13th bit can be set to '0' and include that bit into network part of organization B so the valid allocation of addresses to B is 245.248.128.0/22