Interview Question & Answer MCSE & CCNA

CCNA: What is the Difference between Hub and Switch

What is FECN, BECN, VTP Pruning, Split Horizon and Root Poisoning

Question 100:- What is DE {Discard Eligibility}?

Ans :-DE Stands For Discard Eligibility. This Term is basically used in frame relay technology in the Network. It provides to stop the congestion in frame relay technology.

 

Question 101: What is FECN {Forward Explicit Congestion Notification}?

Ans :- FECN stands for forward Explicit Congestion Notification. This Term is basically used in Frame relay technology in The Network. It provides to stop the congestion in frame relay technology.

 

Question 102: What is BECN {Backward Explicit Congestion Notification}?

Ans :- BECN Stands for Backward Explicit congestion Notification. This Term is basically used in frame-relay technology In the Network. It provides to stop the congestion in frame relay technology.

 

Question 103:  What is VTP Pruning?

Ans :-  The term VTP means Virtual Trunk Protocol. It uses for inter vlan communication means communication between different vlans. Pruning means reduction of unnecessary traffic. If VTP is configured in a switch then all the switches in the same domain will aware of the all vlans and it led to huge amount of unnecessary traffic. VTP pruning should be enable only on server switch and all other client switch will automatically accept that by default,pruning is disable so we have to enable that. We can enable it by VTP pruning vlan configuration command. After enable this only respected vlans those configured on the switches will get the broadcast,not other vlans.

Question 104:  What is Split Horizon?

Ans :- Its a technique using in distance vector routing protocol such as RIP for avoiding routing loops by preventing the routing path to be sent back to the node from where it receives.This technique transmits the packet in forward direction and send to all the attached nodes except the node from where it receives.This technique prevents routing loop.

Question 105:  What is Root Poisoning?

Ans  :-
Its again a loop avoidance technique using in protocol such as RIP. Its a method of preventing a network from sending packet through a path that has been invalid. Whenever a router detects an invalid route which can be caused by any cable or node failure, it inform all the routers in the network that the bad route has a hop count of 16,which is infinity. By this way all the routers know about that failure and choose a different path for packet forwarding.