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| 2. | CCNA Exploration 4.0, Network Fundamentals, Student Lab Manual, Cisco Systems, 2007. |
| 3. | W. Stallings, Data and Computer Communication (9th edition), Prentice-Hall, 2011. |
| 4. | B. A. Forouzan, Data Communication and Networking (5th edition), McGraw-Hill, 2012. |