6/15/2015 Network Fundamentals IV Dr. Tim Lin ECE Department Cal Poly Pomona Add Corporate Logo Here EXIT > >

Agenda What is Computer Network ISO / OSI model Internet Organizations IP Addresses –v4 Classful Classless –V6 IP Protocol –Header ICMP Protocol ARP Protocol UDP Protocol TCP Protocol –Header –Flow Control –Error Control –Congestion Control FTP Protocol HTTP Protocol SMTP Protocol Technology (LAN)

Figure 21.2 Opening the control connection

Figure 21.3 Creating the data connection

Figure 21.6 Command processing

Figure 21.8 Example 21.1

We show an example of anonymous FTP. We assume that some public data are available at internic.net. Example Example 21.4

Figure 22.3 Browser

Figure 22.4 URL Host can be a host name, an IP address or localhost

Figure HTTP transaction

Figure Example 22.4

Figure Example 22.5

HTTP uses ASCII characters. The following shows how a client can directly connect to a server using TELNET, which logs into port 80. Example Example 22.6

Figure 23.1 First scenario

Figure 23.2 Second scenario

Figure 23.6 Format of an

Figure address

Figure Message transfer

Figure 3.1 IEEE standard for LANs

Figure 3.2 Ethernet Frame

Figure 3.3 Maximum and minimum lengths

Figure 3.5 Unicast and multicast addresses

Define the type of the following destination addresses: a. 4A:30:10:21:10:1A b. 47:20:1B:2E:08:EE c. FF:FF:FF:FF:FF:FF Solution To find the type of the address, we need to look at the second hexadecimal digit from the left. If it is even, the address is unicast. If it is odd, the address is multicast. If all digits are F’s, the address is broadcast. Therefore, we have the following: a. This is a unicast address because A in binary is 1010 (even). b. This is a multicast address because 7 in binary is 0111 (odd). c. This is a broadcast address because all digits are F’s. Example Example 3.1

Figure 3.6 Ethernet evolution through four generations 10Base2, 10Base5, 10BaseT

Figure 3.10 Standard Ethernet implementation

Figure 3.7 Space/time model of a collision in CSMA TimeTime BACD

Figure 3.8 Collision of the first bit in CSMA/CD

Figure 3.13 Basic service sets (BSSs)

Figure 3.14 Extended service sets (ESSs)

Figure 3.15 CSMA/CA flow diagram

Figure 3.17 Frame format