Wednesday, March 27, 2013

Basic Networking Questions and Answers Part 2 (System Administrator and Desktop Support)

1. Explain AT & T color code for straight cable.


Orange white

Green white

Blue white

Brown white

2. What is the recommended CAT5 cable length between switch and PC?


100 meters

3. Which pins are used in CAT5 cable?


1 , 2 , 3, 6
Pin1 = tx +
Pin2 = tx –
Pin3 = rx +
Pin6 = rx –

4. Where to use the cross cable and the straight cable?


For Similar device the cross cable is used and if the device is not similar then the straight cable is used.

Example of Similar device where cross cable is used.

Switch to switch
Hub to hub
Switch to Hub
PC to router
Router to router

Example of Non-similar devices for straight cable.

PC to switch
PC to hub
Router to switch

D-Link Ethernet Switch

5. Difference between DOMAIN  and  WORK GROUP


Centralized network model                                  
Domain is controlled by DC                                 
Centralized login                                                   
Centralized user database                                      
Easy and centralized management                         
Good for large network 


Decentralized network
No centralized network
Local login
Local user database
Good for small network

6. Different type of LAN topologies.

A. Bus topology

10base2(thin net)
10base5 (thick net)

B. Star topology

10baseT (Ethernet, 10 Mbps)
10baseTX (fast Ethernet, 100 Mbps)
100baseFX (fast Ethernet with Fiber)
1000baseTX (gigabyte Ethernet, 1000 Mbps)
1000baseFX (gigabyte Ethernet with fiber)

C. WAN topologies

PSTN (public switched telephone network)
ISDN (integrated switched digital network)
Frame relay
Leased line
DSL (Digital subscriber line)

7. A short description about all 7 layers of  OSI

Application layer    = user interface and application
Presentation layer  = data conversion and transformation
Session layer         = keep data of different application separately
Transport layer      = end to end connectivity using port numbers
Network layer        = logical addressing like ip address
Data link layer       = physical addressing like MAC address
Physical layer        = physical transmission of data using 0's and 1's.

8. Difference between switch and hub?

SWITCH                                                                        HUB

a. Works at layer 2                                              Works at layer 1
b.Use MAC address for packet forwarding  Use broadcast for packet forwarding
c. Doesn’t required CSMA/CD                                 Requires CSMA/CD
d. Faster then HUB                                              Slow then switch
e. Full duplex                                                      Half duplex
f. High throughput                                               Low throughput

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