most favorite interview questions by recruiters...(2)

Que-1 what is the difference between acknowledgments and handshaking?

Answer: Handshaking is used to negotiate the properties of a connection that is being established. Acknowledgments are used to tell the sender that data has been successfully received by the destination during the use of a connection.

Que-2 What do you need with BGP when you have a firewall between peers?
Answer: ebgp multihop

Que-3 If you look at the routing table what does IA mean?
Answer: inter area route

Que-4 In OSPF if you want the metric to increase on external routes what do you need to do?
Answer: metric type 1

Que-5 You have one public IP but you have many hosts what can you do?
Answer: Nat with overload (PAT)

Que-6 What are the possible reasons for stuck in active?
Answer: Link failure

Que-7 How is the root bridge elected?
Answer: lowest mac address ( bridge id)

Que-8 How do you set up dhcp on a router?
Answer: ip dhcp pool DHCPPOOL
domain-name hiremenow.com
network x.x.x.x/x
dns-server x.x.x.x x.x.x.x
default-router x.x.x.x
excludes...

Que-9 Explain how Eigrp works?
Answer: Routers send out hello's and forms neighbor relationships.

Each router receives advertisements from each neighbor with AD(metric) and FD (feasible distance) to a route. FD is the metric from this router through the neighbor to the network.

EIGRP uses the DUAL algorithm to choose best paths by looking
at AD and FD. The path with the lowest metric(AD) is called the successor
path. EIGRP paths with a lower AD than the FD of the successor path
are guaranteed loop-free and called feasible successors.
Lowest FD = successor path.
Lowest AD = feasible successor.

Que-10 How is a shortest path tree built? (Multicast)
Answer: PIM-SM uses a shared tree to distribute the information about active sources. Once the traffic knows the best path it switches over to an optimized source distribution tree.