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4.2-4. Longest prefix matching. Consider the following forwarding table below. Indicate the output to link interface to which a datagram with the destination addresses below will be forwarded under longest prefix matching. (Note: The list of addresses is ordered below. If two addresses map to the same output link interface, map the first of these two addresses to the first instance of that link interface.) [Note: You can find more examples of problems similar to this here.] Destination Address Range Link interface 11001000 00010111 00010 *** ******** 11001000 00010111 00011000 1 ******** 11001000 00010111 00011*** 2 ******k** otherwise 3 11001000 00010111 00010010 10101101 A. This is the first destination address in the list that maps to output port 0. O 11001000 00010111 00011000 00001101 e 11001000 00010111 00011001 11001101 B. This is the first destination address in the list that maps to output port 1. 10001000 11100000 00011000 00001101 C. This is the first destination address in the list that maps to output port 11001000 00010111 00011000 11001111 2 e 11001000 00010111 00010001 01010101 D. This is the first destination address in the list that maps to output port 3. O 11001000 00010111 00011101 01101101 E. This is the second destination address in the list that maps to output port 3

4.2-4. Longest prefix matching. Consider the following forwarding table below. Indicate the output to link interface to which a datagram with the destination addresses below will be forwarded under longest prefix matching. (Note: The list of addresses is ordered below. If two addresses map to the same output link interface, map the first of these two addresses to the first instance of that link interface.) [Note: You can find more examples of problems similar to this here.] Destination Address Range Link interface 11001000 00010111 00010 *** ******** 11001000 00010111 00011000 1 ******** 11001000 00010111 00011*** 2 ******k** otherwise 3 11001000 00010111 00010010 10101101 A. This is the first destination address in the list that maps to output port 0. O 11001000 00010111 00011000 00001101 e 11001000 00010111 00011001 11001101 B. This is the first destination address in the list that maps to output port 1. 10001000 11100000 00011000 00001101 C. This is the first destination address in the list that maps to output port 11001000 00010111 00011000 11001111 2 e 11001000 00010111 00010001 01010101 D. This is the first destination address in the list that maps to output port 3. O 11001000 00010111 00011101 01101101 E. This is the second destination address in the list that maps to output port 3

Database System Concepts
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
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### 4.2-4. Longest Prefix Matching In this section, we explore the concept of longest prefix matching using a forwarding table. The task is to determine the output link interface for datagrams based on their destination addresses, using the longest matching prefix strategy. #### Forwarding Table | **Destination Address Range** | **Link Interface** | |-----------------------------------------------------------|--------------------| | `11001000 00010111 00010*** ********` | 0 | | `11001000 00010111 00011000 ********` | 1 | | `11001000 00010111 00011*** ********` | 2 | | *otherwise* | 3 | #### Address List 1. `10010000 00010111 00010010 10101101` 2. `11001000 00010111 00011000 00001101` 3. `11001000 00010111 00011101 11001101` 4. `10001000 11100000 00011000 00011001` 5. `11001000 00010111 00011000 11001111` 6. `11001000 00010111 00010001 01010101` 7. `11001000 00010111 00011101 01101101` #### Analysis - **A.** This is the first destination address in the list that maps to output port 0. - **B.** This is the first destination address in the list that maps to output port 1. - **C.** This is the first destination address in the list that maps to output port 2. - **D.** This is the first destination address in the list that maps to output port 3. - **E.** This is the second destination address in the list that maps to output port 3. - **F.** This is the second destination address in the list that maps to output port 1. - **G.** This is the second destination address in the list that maps to output port 0. - **H.** This is the second destination address in the list that maps to output port 2. This chart demonstrates how the longest prefix matching technique determines the optimal routing path by selecting the most specific available route for each destination address.
Transcribed Image Text:### 4.2-4. Longest Prefix Matching In this section, we explore the concept of longest prefix matching using a forwarding table. The task is to determine the output link interface for datagrams based on their destination addresses, using the longest matching prefix strategy. #### Forwarding Table | **Destination Address Range** | **Link Interface** | |-----------------------------------------------------------|--------------------| | `11001000 00010111 00010*** ********` | 0 | | `11001000 00010111 00011000 ********` | 1 | | `11001000 00010111 00011*** ********` | 2 | | *otherwise* | 3 | #### Address List 1. `10010000 00010111 00010010 10101101` 2. `11001000 00010111 00011000 00001101` 3. `11001000 00010111 00011101 11001101` 4. `10001000 11100000 00011000 00011001` 5. `11001000 00010111 00011000 11001111` 6. `11001000 00010111 00010001 01010101` 7. `11001000 00010111 00011101 01101101` #### Analysis - **A.** This is the first destination address in the list that maps to output port 0. - **B.** This is the first destination address in the list that maps to output port 1. - **C.** This is the first destination address in the list that maps to output port 2. - **D.** This is the first destination address in the list that maps to output port 3. - **E.** This is the second destination address in the list that maps to output port 3. - **F.** This is the second destination address in the list that maps to output port 1. - **G.** This is the second destination address in the list that maps to output port 0. - **H.** This is the second destination address in the list that maps to output port 2. This chart demonstrates how the longest prefix matching technique determines the optimal routing path by selecting the most specific available route for each destination address.
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