TimTaiLieu.vn - Tài liệu, ebook, giáo trình, đồ án, luận văn

26.3 NETWORK ADDRESS TRANSLATION (NAT) Network address translation (NAT) allows a site to use a set of private addresses for internal communication and a set of global Internet addresses for communication with another site. The site must have only one single connection to the global Internet through a router that runs NAT software. The topics ...

15 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 553 | Lượt tải: 0

25.3 STREAMING STORED AUDIO/VIDEO We turn our attention to a specific applications called streaming stored audio and video. We use four approaches to show how a file can be downloaded, each with a different complexity. The topics discussed in this section include: First Approach: Using a Web Server Second Approach: Using a Web Server with Me...

52 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 603 | Lượt tải: 0

Note: The IP addresses are designed to work with stationary hosts because part of the address defines the network to which the host is attached. Note: Mobile IP has two addresses for a mobile host: one home address and one care-of address. The home address is permanent; the care-of address changes as the mobile host moves from one network to ano...

24 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 721 | Lượt tải: 0

23.3 ROUTING THE CELLS The ATM network creates a route between two routers. We call these routers entering-point and exiting-point routers. The topics discussed in this section include: Addresses Address Binding 23.4 ATMARP ATMARP finds (maps) the physical address of the exiting-point router given the IP address of the exiting-point router....

28 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 582 | Lượt tải: 0

Example 1 This example retrieves a document. We use the GET method to retrieve an image with the path /usr/bin/image1. The request line shows the method (GET), the URL, and the HTTP version (1.1). The header has two lines that show that the client can accept images in the GIF or JPEG format. The request does not have a body. The response message c...

36 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 575 | Lượt tải: 0

Note: SMI defines the general rules for naming objects, defining object types (including range and length), and showing how to encode objects and values. SMI defines neither the number of objects an entity should manage, nor names the objects to be managed nor defines the association between the objects and their values.

48 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 720 | Lượt tải: 0

Example 1 Let us see how we can directly use SMTP to send an email and simulate the commands and responses we described in this section. We use TELNET to log into port 25 (the well-known port for SMTP). We then use the commands directly to send an email. In this example, forouzanb@adelphia.net is sending an email to himself. The first few lines sh...

42 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 833 | Lượt tải: 0

Example 1 (cONTINUED) 6. The client issues a passive open on an ephemeral port for the data connection and sends the PORT command (over the control connection) to give this port number to the server. 7. The server does not open the connection at this time, but it prepares itself for issuing an active open on the data connection between po...

48 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 599 | Lượt tải: 0

Example 1 Figure 18.11 shows an example of option negotiation. In this example, the client wants the server to echo each character sent to the server. In other words, when a character is typed at the user keyboard terminal, it goes to the server and is sent back to the screen of the user before being processed. The echo option is enabled by the se...

41 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 658 | Lượt tải: 0

17.1 NAME SPACE The names assigned to machines must be unique because the addresses are unique. A name space that maps each address to a unique name can be organized in two ways: flat or hierarchical. The topics discussed in this section include: Flat Name Space Hierarchical Name Space 17.2 DOMAIN NAME SPACE The domain name space is hierarc...

49 trang | Chia sẻ: thanhle95 | Ngày: 02/07/2021 | Lượt xem: 788 | Lượt tải: 0