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Welcome to Network Interview Questions!

What are BGP and their attributes?

The Border Gateway Protocol (BGP) is an inter autonomous system routing protocol. An autonomous system is a network or group of networks under a common administration and with common routing policies. BGP is used to exchange routing information for the Internet and is the protocol used between Internet service providers (ISP). Customer networks, such as universities and corporations, usually employ an Interior Gateway Protocol (IGP) such as RIP or OSPF for the exchange of routing information within their networks. Customers connect to ISPs, and ISPs use BGP to exchange customer and ISP routes. When BGP is used between autonomous systems (AS), the protocol is referred to as External BGP (EBGP). If a service provider is using BGP to exchange routes within an AS, then the protocol is referred to as Interior BGP (IBGP).

BGP Attributes  are

1. Weight                                              5. AS_path

2. Local preference                                 6. Next hop

3. Multi-exit discriminator                         7. Community

4.Origin

 

What is PPPoE?

Point to Point Protocol over Ethernet (PPPoE) is network protocols that allow data communication between two network entities or points, which supports network layer protocols including IPv4 and IPv6. PPP supports three types of user authentication protocols that provide varying levels of security.

  1. PAP                          2.  CHAP                                3.  EAP

PAP

CHAP

1. Clear text

1. Encrypted

2. Less secure

2. High secure

3. Two way handshake method

3. Three way handshake method

         Auth. Request

   Challenge

         Auth. Acknowledgment

   Response

 

  Success

4. No periodic Check up

4. Periodical Check up

Extensible Authentication Protocol (EAP) is most commonly used for authentication on wireless networks

What are the timers for dynamic routing protocol?

 

Rip

IGRP

EIGRP

OSPF

Hello

None

None

60 sec

10 sec

Update timers

30 sec

90 sec

 

 

Dead timers

180 sec

3*hello

3*hello

4*hello

What is the AD Value for Dynamic routing protocols?

 

Rip

IGRP

EIGRP

OSPF

BGP

AD

120

100

90

110

20

 

 

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CCNA Overview Page

 

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