BGP and inter-domain routing in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe BGP's main function.

Computer Networks

BGP is primarily used to [1] routing information between different autonomous systems.

Drag options to blanks, or click blank then click option'

Ablock

Bignore

Cexchange

Dencrypt

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'block' or 'ignore' because they sound like network actions but are incorrect.

BGP (Border Gateway Protocol) is used to exchange routing information between different autonomous systems (ASes) on the internet.

2fill in blank

medium

Complete the sentence to explain what an autonomous system (AS) is.

Computer Networks

An autonomous system is a collection of IP networks under a common [1] that presents a common routing policy to the internet.

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Aprotocol

Badministration

Chardware

Dsoftware

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'protocol' with 'administration'.

An autonomous system (AS) is a group of IP networks managed by a single organization or administration that shares a routing policy.

3fill in blank

hard

Fix the error in the statement about BGP path selection.

Computer Networks

BGP selects the best path based on the [1] attribute, which represents the number of hops to the destination.

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AAS_PATH

BNEXT_HOP

CLOCAL_PREF

DMED

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing NEXT_HOP or LOCAL_PREF which serve different purposes.

The AS_PATH attribute in BGP lists the autonomous systems a route has passed through and is used to select the shortest path (fewest AS hops).

4fill in blank

hard

Fill both blanks to complete the BGP route filtering rule.

Computer Networks

A BGP router will [1] routes from an AS if the route's [2] attribute indicates it came from that AS.

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Areject

Baccept

CAS_PATH

DNEXT_HOP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing NEXT_HOP with AS_PATH or choosing accept instead of reject.

BGP routers can reject routes if the AS_PATH attribute shows the route originated from a specific AS, helping prevent routing loops.

5fill in blank

hard

Fill all three blanks to complete the BGP route advertisement example.

Computer Networks

The BGP router advertises a route with the prefix [1] to its neighbor [2] using the [3] attribute to indicate the next hop.

Drag options to blanks, or click blank then click option'

A192.168.1.0/24

BAS 65001

CNEXT_HOP

DAS_PATH

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing AS_PATH with NEXT_HOP or confusing prefix with AS number.

The router advertises the IP prefix 192.168.1.0/24 to neighbor AS 65001 and uses the NEXT_HOP attribute to specify the next hop IP address.