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Networking Flashcards

1
Q
  1. Can you tell me the names of layers in the OSI Networking Model?
A
  1. Physical layer
  2. Data link Layer
  3. Network Layer
  4. Transport Layer
  5. Session Layer
  6. Presentation layer
  7. Application layer
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2
Q
  1. What is difference between Straight-through and Crossover Cable?
A

When you connect two devices of different types together, you use a straight through cable.

When you connect two devices of the same type together, you use a crossover cable.

All cables are straight through if you insert a network device between two devices of the same kind.

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3
Q
  1. If I wanted to connect a PC directly to another PC which cable would I use?
A

Ethernet cable.

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4
Q
  1. How many wires/pairs of RJ-45 cable are used according to 100Base-TX standard?
A

4 wires and 2 pairs.

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5
Q
  1. What is difference between switching and routing?
A

Routing works at the network layer and is responsible to find the shortest path for a packet where as a switch connects devices within a network.
Routers connect devices across multiple networks.

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6
Q
  1. Do you know what the name is for the physical address of network equipment?
A

MAC address.

Media Access Control

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7
Q
  1. How would you explain what a subnet is?
A

It’s a network within a network, subnets make networks more efficient as the traffic can pass through unnescessary routers to reach it’s destination.

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8
Q
  1. How do make 2 hosts on different subnets talk to each over?
A

You need to set the gateway address on each router to other subnets server address.

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9
Q
  1. What is a Gateway?
A

A networking device that acts as a gate between two networks

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10
Q
  1. What is TFTP?
A

Trival File Transfer Protocol

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11
Q
  1. What is the difference between TCP and UDP? When would you use TCP or UDP?
A

TCP corrects for errors during data flow and makes sure there are no dropped packets.
Example e-mail. (slower speed)

UDP does not error correct during data flow.
Example online video games, voice calls. (faster speed)

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12
Q
  1. What is the ARP protocol?
A

Address Resolution Protocol

Is a communication protocol used for discovering the link layer address such as a MAC address.

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13
Q
  1. Can you describe the OSPF protocol?
A

Open Shortest Path First

Is a routing protocol for Internet Protocol networks. It uses a link state routing algorithm and falls into the group of interior gateway protocols, operating within a single autonomous system.

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14
Q
  1. On a Cisco device what is the difference between the running-config and startup config?
A

Running config is stored on RAM.

Startup-config is stored on ROM.

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15
Q
  1. Can you explain shortly what DNS is and how it works?
A

The Domain Name System is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities.

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16
Q
  1. What is the difference between Multi Mode and Single Mode fiber?
A

Single mode fiber use’s one wavelength of light to pass data,
multi mode use’s serveral.

17
Q
  1. How would you check for the IP Address on a Windows computer?
A

> Windows
Open the Windows Start menu and right-click
Network.
Click “Properties.
Click “View Status” to the right of
Wireless Network Connection, or
Local Area Connection for wired connections.
Click “Details” and look for the IP address in the new window

18
Q
  1. How would you check for the IP Address on a Linux computer?
A

Linux

> ifconfig -a.
ip addr (ip a)
hostname -I | awk ‘{print $1}’
ip route get 1.2. …

19
Q
  1. How would you check for the IP Address on a Fedora computer?
A

Fedora

> Wifi
Settings
click the setting icon next to the Wifi name that you are connected to → Ipv4 and Ipv6 both can be seen.

nmcli -p device show.

20
Q
  1. What Linux distributions do you know or have used?
A 
Ubuntu, 
Fedora, 
SuSE, 
RedHat, 
CentOS, 
Debian, 
Android.
21
Q
  1. How you start or stop services (daemon) in Linux operating system?
A

etc-init.d = start or stop

init.d or “service start”

22
Q
  1. How would you check how long a Linux machine is running since its last re-boot?
A

Uptime

23
Q
  1. How would you check which folder you are in?
A

PWD

24
Q
  1. How would you check the contents of a folder?
A

LS

25
Q
  1. How would you create a folder?
A

MKDIR

26
Q
  1. How would you check the used storage?
A

DF -H or

DU -H

27
Q
  1. How would you connect to a remote server?
A

SSH

Telnet

28
Q
  1. How would you shut down a Linux machine?
A 
Shutdown Reboot 
(Shutdown -h now) 
(Shutdown -r now )
29
Q
  1. How would you check the processes running?
A

TOP PS -EF

30
Q
  1. How would you kill a specific process running?
A

Kill -9 PID

31
Q
  1. How would you check the available memory?
A

Free

32
Q
  1. What is the Linux kernel?
A

Heart of OS / Connects HW to SW

33
Q
  1. What is kernel module?
A

Like Hardware Driver in Windows, only loaded when needed

34
Q
  1. How you would check if particular module is loaded?
A

(Modprobe)
(Ismod)
(there are different ways)

35
Q
  1. Describe the Linux file system.

What directories can you find in a standard / typical Linux file system?

A

I would normally only look for 4

36
Q

How would you check for corruption in a Linux file system?

A

FSCK

37
Q

How would you find IP address?

A

IFConfig or

IPAddress Show

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