How to forward to a border router? Consider the network shown below. Suppose AS1, AS2, AS3, and AS4 are running OSPF for their intra-AS routing protocol and that all links have a weight of 1. Initially suppose there is no link between AS2 and AS4. Once router 1d learns about destination x, it will need to install a forwarding table entry to x. Indicate which one of the statements below are true. 3b 3c AS 3 3a 4c 1a 4b 21 AS 4 1c AS 1 1d 22 4a 1b X 2a 2c AS 2 2b 1d will forward along z2 since BGP has computed the path to 1c is via z2. 1d will forward along z2 since OSPF has computed the path to 1c is via z2. 1d will forward along z1 since hot potato routing forwards clockwise. 1d will forward along z1 since BGP has computed the path to 1c is via z1. 1d will forward along z1 since OSPF has computed the path to 1c is via z1.

How to forward to a border router? Consider the network shown below. Suppose AS1, AS2, AS3, and AS4 are running OSPF for their intra-AS routing protocol and that all links have a weight of 1. Initially suppose there is no link between AS2 and AS4. Once router 1d learns about destination x, it will need to install a forwarding table entry to x. Indicate which one of the statements below are true. 3b 3c AS 3 3a 4c 1a 4b 21 AS 4 1c AS 1 1d 22 4a 1b X 2a 2c AS 2 2b 1d will forward along z2 since BGP has computed the path to 1c is via z2. 1d will forward along z2 since OSPF has computed the path to 1c is via z2. 1d will forward along z1 since hot potato routing forwards clockwise. 1d will forward along z1 since BGP has computed the path to 1c is via z1. 1d will forward along z1 since OSPF has computed the path to 1c is via z1.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

How to forward to a border router? Consider the network shown below. Suppose
AS1, AS2, AS3, and AS4 are running OSPF for their intra-AS routing protocol and
that all links have a weight of 1. Initially suppose there is no link between AS2 and
AS4. Once router 1d learns about destination x, it will need to install a forwarding
table entry to x. Indicate which one of the statements below are true.
3b
3c
AS 3
3a
4c
1a
4b
21
AS 4
1c
AS 1
1d
22
4a
1b
X
2a
2c
AS 2
2b
1d will forward along z2 since BGP has computed the path to 1c is via z2.
1d will forward along z2 since OSPF has computed the path to 1c is via z2.
1d will forward along z1 since hot potato routing forwards clockwise.
1d will forward along z1 since BGP has computed the path to 1c is via z1.
1d will forward along z1 since OSPF has computed the path to 1c is via z1.

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How to forward to a border router? Consider the network shown below. Suppose AS1, AS2, AS3, and AS4 are running OSPF for their intra-AS routing protocol and that all links have a weight of 1. Initially suppose there is no link between AS2 and AS4. Once router 1d learns about destination x, it will need to install a forwarding table entry to x. Indicate which one of the statements below are true. 3b 3a AS 3 4c 1a 4b AS 4 1c AS 1 1d 4a 1b 2c AS 2 2b O 1d will forward along z1 since OSPF has computed the path to 1c is via z1. O 1d will forward along z2 since BGP has computed the path to 1c is via z2. O 1d will forward along z2 since OSPF has computed the path to 1c is via z2. O 1d will forward along z1 since BGP has computed the path to 1c is via z1. O 1d will forward along z1 since hot potato routing forwards clockwise.
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