### Routing Table Example#### Table:| SubnetNumber | SubnetMask | NextHop ||----------------|------------------|------------|| 128.96.39.0 | 255.255.255.128 | Interface 0|| 128.96.39.128 | 255.255.255.128 | Interface 1|| 128.96.40.0 | 255.255.255.128 | R2 || 192.4.153.0 | 255.255.255.192 | R3 || (default) | | R4 |### Instructions:The router can deliver packets directly over interfaces 0 and 1, or it can forward packets to routers R2, R3, or R4. Describe the router's action for packets addressed to the following destinations:a) **128.96.39.130** b) **128.96.39.100** c) **128.96.39.128** d) **128.96.40.10** e) **192.4.153.100** f) **192.4.153.253** g) **128.4.230.99** ### Explanation:- **128.96.39.130**: The closest match in the routing table is subnet **128.96.39.128** with next hop **Interface 1**.- **128.96.39.100**: The closest match in the routing table is subnet **128.96.39.0** with next hop **Interface 0**.- **128.96.39.128**: The closest match in the routing table is subnet **128.96.39.128** with next hop **Interface 1**.- **128.96.40.10**: The closest match in the routing table is subnet **128.96.40.0** with next hop **R2**.- **192.4.153.100**: The closest match in the routing table is subnet **192.4.153.0** with next hop **R3**.- **192.4.153.253**: The closest match in the routing table is subnet **192.4.153.0** with next hop **R3

Router: The interfaces 0 and 1 the router directly delivers packets. The router forwards packets to…

Suppose a router has built up the routing table shown in the Table below. SubnetNumber 128.96.39.0 128.96.39.128 128.96.40.0 192.4.153.0 (default) SubnetMask 255.255.255.128 255.255.255.128 255.255.255.128 255.255.255.192 a) 128.96.39.130 b) 128.96.39.100 c) 128.96.39.128 d) 128.96.40.10 NextHop Interface 0 Interface 1 R2 R3 R4 The router can deliver packets directly over interfaces 0 and 1, or it can forward packets to routers R2, R3, or R4. Describe what the router does with a packet addressed to each of the following destinations:

Suppose a router has built up the routing table shown in the Table below. SubnetNumber 128.96.39.0 128.96.39.128 128.96.40.0 192.4.153.0 (default) SubnetMask 255.255.255.128 255.255.255.128 255.255.255.128 255.255.255.192 a) 128.96.39.130 b) 128.96.39.100 c) 128.96.39.128 d) 128.96.40.10 NextHop Interface 0 Interface 1 R2 R3 R4 The router can deliver packets directly over interfaces 0 and 1, or it can forward packets to routers R2, R3, or R4. Describe what the router does with a packet addressed to each of the following destinations:

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

Chapter1: Introduction

Section: Chapter Questions

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Question

### Routing Table Example

#### Table:
| SubnetNumber | SubnetMask | NextHop |
|----------------|------------------|------------|
| 128.96.39.0 | 255.255.255.128 | Interface 0|
| 128.96.39.128 | 255.255.255.128 | Interface 1|
| 128.96.40.0 | 255.255.255.128 | R2 |
| 192.4.153.0 | 255.255.255.192 | R3 |
| (default) | | R4 |

### Instructions:
The router can deliver packets directly over interfaces 0 and 1, or it can forward packets to routers R2, R3, or R4. Describe the router's action for packets addressed to the following destinations:

a) **128.96.39.130**
b) **128.96.39.100**
c) **128.96.39.128**
d) **128.96.40.10**
e) **192.4.153.100**
f) **192.4.153.253**
g) **128.4.230.99**

### Explanation:

- **128.96.39.130**: The closest match in the routing table is subnet **128.96.39.128** with next hop **Interface 1**.
- **128.96.39.100**: The closest match in the routing table is subnet **128.96.39.0** with next hop **Interface 0**.
- **128.96.39.128**: The closest match in the routing table is subnet **128.96.39.128** with next hop **Interface 1**.
- **128.96.40.10**: The closest match in the routing table is subnet **128.96.40.0** with next hop **R2**.
- **192.4.153.100**: The closest match in the routing table is subnet **192.4.153.0** with next hop **R3**.
- **192.4.153.253**: The closest match in the routing table is subnet **192.4.153.0** with next hop **R3

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