Networking Interview Questions & Answer with Explanation (Part-3)

Networking Interview Questions 44-53

44. Do supernetting (Summarization)

172.16.128.0/18,  172.16.192.0/20  ,  172.16.224.0/22

Supernetting

172.16.128.0/18,  172.16.192.0/20  ,  172.16.224.0/22 172.16.128.0                        10000000 172.16.192.0                        11000000 172.16.224.0                        11100000 172.16.                                  10000000 . 00000000 Ans: 172.16.128.0/17

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45. What is Process ID? Write down the range of process ID? Where you use this process ID?

Process ID of OSPF

Process ID: (A locally unique ID) identifier of the local OSPF process.

Range: 1 - 65535

Usage : in OSPF

 

46. What is AS ID? Write down the range of AS ID? Where you use this AS ID?

AS ID/ASN of EIGRP

AS ID/ASN: (Autonomous System Number) Globally Unique ID/Number. A number that uniquely identifies a particular autonomous system.

Range: 1-65535

Usage: in EIGRP

 

47. How many steps for selecting Router-ID at OSPF? Write down these steps.

3 Steps for selecting Router-ID in OSPF

1.     Manual configuration of the router ID. 2.     Highest IP address on a loopback interface. 3.     Highest IP address on a non-loopback interface.

 

48. Write down  the name of states of OSPF Neighbor States process.

8 OSPF Neighbor States

1.    Down state. 2.    Attempt state. 3.    Init state. 4.    2-Way state. 5.    Exstart state. 6.    Exchange state. 7.    Loading state.           8.     Full state.

 

49. What is DR, BDR, ABR, and ASBR in OSPF?

DR, BDR, ABR, and ASBR in OSPF
DR	Designated Router
BDR	Backup Designated Router
ABR	Area Boarder Router : Which connects multiple with area
ASBR	Autonomous System Boarder Router Which connects multiple AS

  For Details of Question no 45-49 watch this video.

50. What is the metric of RIP, OSPF, EIGRP.

Metrics and Metric of Routing protocol
Metrics	A number denoting the best route (to reach a subnet) in a single routing protocol on a single router.
Routing Protocol	Metrics
RIP	Hop count
OSPF	Bandwidth
EIGRP	Bandwidth, Delay, MTU, Load, Reliability.

 

51. What is Administrative Distance? Write down the AD Value of Static Route, RIP, OSPF, EIGRP.

Administrative distance and AD table
Administrative distance	AD is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route.
Routing Protocol	AD Value
Static Route	1
EIGRP	90
OSPF	110
RIP	120

  For Details of Question no 50-51 watch this video.

52. What is successor & Feasible successor in EIGRP?

Successor	The primary route used to reach a destination. The successor route is kept in the routing table. Notice that successor is the best route to that destination.
Feasible successor	The backup route.

 

53. What is Advertise distance & feasible distance in EIGRP?

Advertised distance	The cost from the neighbor to the destination.
Feasible distance	The sum of the AD + the cost between the local router and the next-hop router.

  For Details of Question no 52-53 watch this video.