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Crytography (6)
Public-Key Algorithms So is called Asymmetric-key Algorithms Based on some hard problems such as integer factoring, When data is encrypted with one key, the other key must be used to decrypt the data, and vice versa. Each entity can be assigned a key pair: a private and public key Private key is known only to owner ...

27 trang | Chia sẻ: thanhle95 | Ngày: 03/07/2021 | Lượt xem: 784 | Lượt tải: 2

Forms (4)
Input types (cont.) RADIO Ex: Option 1
Option 2
Option 3 CHECKBOX

43 trang | Chia sẻ: thanhle95 | Ngày: 03/07/2021 | Lượt xem: 747 | Lượt tải: 2

Domain Name System - DNS
IP addresses can be used to identify a host machine on the Internet As people moves around, the addresses need to be changed accordingly as well
ASCII names have been invented to decouple host names and their IPs to provide more flexibility
The DNS was invented to manage and resolve host names into IP address...

55 trang | Chia sẻ: thanhle95 | Ngày: 03/07/2021 | Lượt xem: 831 | Lượt tải: 2

Main window thread •Main Server Form •Create a thread to listen and accept incoming connection Child thread •Listen and accept incoming connection •Create a thread to handle connection Grand-child thread •Handle a connection •Create a thread to handle socket InputStream •Handle socket InputStream

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The Internet Transport Protocols UDP – User Datagram Protocol • Connection-less service • Useful in client-server situations: Remote Procedure Call, real-time AV streaming TCP – Transmission Control Protocol • Connection oriented service • Reliable byte stream services over unreliable network • Most widely used in Internet

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Routing with Subnetting
Routing to destination to an outside network is done as usual
Routing table adds more entries for routing within the network (this-network, subnet, 0): to route message to another subnet (this-network, this-subnet, host): to route message to a host within this-subnet

31 trang | Chia sẻ: thanhle95 | Ngày: 03/07/2021 | Lượt xem: 939 | Lượt tải: 2

General Principles of Congestion Control
Open loop solutions Solve the problems by good design Prevent congestions from happening Make decision without regard to state of the network
Closed loop solutions Using feedback loop Closed Loop Solutions – Three Part Feedback Loop
Monitor the system detect when and where congestion o...

43 trang | Chia sẻ: thanhle95 | Ngày: 03/07/2021 | Lượt xem: 814 | Lượt tải: 2

Services Provided to the Transport Layer
Network layer provides services to the transport layer
Goals of network layer services Independent of router technology The transport layer should be shielded from the number, type and topology of routers Network addresses available to the transport layer should be uniformed and even across LA...

32 trang | Chia sẻ: thanhle95 | Ngày: 03/07/2021 | Lượt xem: 748 | Lượt tải: 2

Content
Broadband wireless
Bluetooth
Network bridges, hubs, switches, routers
Virtual LAN Broadband Wireless - WiMAX • Long-range system, up to 50km • Use licensed spectrum • Provide internet access to end user from ISP • Quality of service can be guaranteed

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ALOHA
Developed by Norman Abramson, in 1970s
Used ground-based radio broadcast
Pure ALOHA Use continuous time No need for global time
Slotted ALOHA Need global time synchronisation Pure ALOHA (1)
Users can transmit whenever they have data to send
If there is a collision, colliding frames will be damaged and will be destro...

37 trang | Chia sẻ: thanhle95 | Ngày: 03/07/2021 | Lượt xem: 633 | Lượt tải: 2