1. 57.120.40.55 Class A 130.45.29.255 Class B 200.1.65.72 Class C

2. How do we get the IP address? Domain name servers translate the domain name to IP address. www.cs.vu.edu 129.167.69.45

3. Web server ecom. cs. vu. edu Sub Domain SLDTLD

4. Domain Hierarchy edu gov netorg com pk vu pu csms ecom1 ecom2 int

5. Name Resolution client ecom.cs.vu.edu 192.12.69.60 8 Local Name server Root Name server VU Name server CS Name server ecom.cs.vu.edu vu.edu, 128.196.128.233 ecom.cs.vu.edu cs.vu.edu, 192.12.69.5 ecom.cs.vu.edu 192.12.69.60 1 2 3 4 5 6 7 16

6. http://vu.edu http://cs.vu.edu http://ecom.cs.vu.edu http://www.cs.vu.edu/folder/home.html

7. MAC Address Consists of 12 hexadecimal characters 090017A9B2EF 09:00:17:A9:B2:EF 09-00-17-A9-B2-EF A pattern of 48 bits is available 2 48 unique MAC addresses possible Institute of Electrical and Electronic Engineers (IEEE) administers the allocation of MAC addresses