A Professional’s Guide to Data Communication in a TCP/IP World phần 3 pptx

... contain additional facilities that are used to detect and isolate line and equipment problems. 2.2 Making a Data Call Consider a host (Host A) in a multilocation company that needs a data file to ... Protocol Stack 25 CHAPTER 2 Data Communication 27 2.1 Communication Equipment 27 2.2 Making a Data Call 29 2 .3 Open Systems Interconnection Model 31 2 .3. 1 OSI M...

Ngày tải lên: 27/06/2014, 00:20

... Figure 3. 13 shows an FDDI frame that encapsulates an IP datagram. Intentionally, it is very similar to frames for IEEE 802 .3 and IEEE 802.5. Like them, when transporting IP datagrams and ARP messages, ... constructed. Added to the IP datagram, they form the IP frame. • In the physical sublayer the logical data stream is converted to a signal stream to match the transmission...

Ngày tải lên: 14/08/2014, 13:20

... link X.25-2 LAP-B Physical X.25-1 X.21 Packet LAP-B X.21 Data link Physical Packet network Node stack Header Network interface layer Packet LAP-B Header LAP-B Trailer DATA DATA ≤ 4096 Logical Channels User-network ... over link AG. Because frame 3 takes the path AGC, and frames 1 and 2 take the path AEFGC, frame 3 arrives at C ahead of frames 1 and 2. 4.2 Nonbroadcast Multiple Access...

Ngày tải lên: 14/08/2014, 13:20

... datagrams. Encapsulating header Authentication header Original datagram D(1) IPSec authentication tunneling datagram D(2) ESP authentication ESP header ESP trailer Original datagram D(1) IPSec encapsulating ... generates an IP datagram addressed to an enterprise destination. This datagram is encapsulated in a PPP frame and may be encrypted. It becomes the users data in a second IP...

Ngày tải lên: 14/08/2014, 13:20

... bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 ... bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data bytes 23 data by...

Ngày tải lên: 14/08/2014, 13:20

... Voice and Data Transporting the caller’s voice and the response of the called party between originating and terminating terminals is straightforward. Setting up and managing the call requires a significant ... reconstructed signal to a 4-kHz bandwidth. A. 4 .3 Passband Formats The sideband components of the passband signal carry the information contained in the baseband signal. A...

Ngày tải lên: 14/08/2014, 13:20

... Frame HEADER PREAMBLE (8 bytes): 0×AA-AA-AA-AA-AA-AA-AA-AB DESTINATION ADDRESS (6 bytes): If address is unicast, contains the hardware address of a specific station. If address is multicast, carries ... Ethernet Frame IEEE 802 .3 MAC HEADER PREAMBLE (7 bytes): 0×AA-AA-AA-AA-AA-AA-AA START DELIMITER (1 byte): 0AB DESTINATION ADDRESS (2 or 6 bytes): If address is unicast, contains the hardwa...

Ngày tải lên: 14/08/2014, 13:20

... The act of sharing data among devices. The act of transfer - ring data among data processing machines over communication links under the control of communication protocol(s). Datagram A protocol ... follows as a Token Ring MAC management frame or a Token Ring data frame. The address fields contain the hardware addresses of the destination and source. IEEE 802.5 LAN Token Rin...

Ngày tải lên: 14/08/2014, 13:20

... beginning and ending of each IP datagram. Server A device that stores data, organizes and maintains databases, and delivers copies of data files to clients on demand. A process that stores and distributes ... Performance Engineering, Robert G. Cole and Ravi Ramaswamy Winning Telco Customers Using Marketing Databases, Rob Mattison WLANs and WPANs towards 4G Wireless, Ramjee Prasad and...

Ngày tải lên: 14/08/2014, 13:20

... 189 B .3. 1 Point -to- Point Protocol (PPP) Frame 189 B .3. 2 X.25 Data Frame 189 B .3. 3 ATM Cell Structure 190 B .3. 4 AAL5 Frame Containing IP Datagram 190 B .3. 5 Frame Relay Frame with 2-Byte Addresses ... purpose is to make origina- tion and destination addresses available to guide data across networks. IP includes several management protocols that are essential to the opera...

Ngày tải lên: 14/08/2014, 13:20