• Mạng máy tính 1 - Cryptography & network securityMạng máy tính 1 - Cryptography & network security

    Symmetric Cipher Model Classical Substitution Ciphers ▫ Caesar Cipher ▫ Monoalphabetic Cipher ▫ Playfair Cipher ▫ Polyalphabetic Ciphers ▫ Vigenère Cipher Cryptanalysis using letter frequencies

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  • Mạng máy tính 1 - Attacks overviewMạng máy tính 1 - Attacks overview

    DoS attack or DDoS is an attempt to make a computer resource unavailable to its intended users. Methods of attack ▫ ICMP flood ▫ Teardrop Attacks ▫ Peer-to-peer attacks

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  • Mạng máy tính 1 - Lecture 9: Socket programming with javaMạng máy tính 1 - Lecture 9: Socket programming with java

    DateTime Server import java.net.*; import java.io.*; import java.util.Date; public class DayTimeServer { public final static int daytimePort = 5000; public static void main(String[] args) { ServerSocket theServer; Socket theConnection; PrintStream p; try { theServer = new ServerSocket(daytimePort)

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  • Mạng máy tính 1 - Lecture 4: Wireless and mobile networksMạng máy tính 1 - Lecture 4: Wireless and mobile networks

    2.5 G systems: voice and data channels  for those who can’t wait for 3G service: 2G extensions  general packet radio service (GPRS)  evolved from GSM  data sent on multiple channels (if available)  enhanced data rates for global evolution (EDGE)  also evolved from GSM, using enhanced modulation  data rates up to 384K  CDMA-2000 (pha...

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  • Mạng máy tính 1 - Chapter 5: Link layer and lansMạng máy tính 1 - Chapter 5: Link layer and lans

    1. Every port is assigned a VLAN color. 2. Every MAC address is assigned a VLAN color. 3. Every layer 3 protocol or IP address is assigned a VLAN color.

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  • Mạng máy tính 1 - Lecture 3: Networking technologiesMạng máy tính 1 - Lecture 3: Networking technologies

    Association Disassociation Reassociation Distribution Integration Distribution Services

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  • Mạng máy tính 1 - Chapter 3: The data link layerMạng máy tính 1 - Chapter 3: The data link layer

    feedback-based flow control, the receiver sends back information (feedback) to the sender to control the flow.  rate-based flow control, the protocol has a built-in mechanism that limits the rate at which senders may transmit data.

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  • Mạng máy tính 1 - Lecture 2: Communication mediaMạng máy tính 1 - Lecture 2: Communication media

    Communication satellites and some of their properties, including altitude above the earth, round-trip delay time and number of satellites needed for global coverage.

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  • Mạng máy tính 1Mạng máy tính 1

    Main sectors • Radiocommunications • Telecommunications Standardization • Development  Classes of Members • National governments • Sector members • Associate members • Regulatory agencies

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  • Computer networks: a systems approach - Chapter 9: ApplicationsComputer networks: a systems approach - Chapter 9: Applications

    We have discussed some of the popular applications in the Internet Electronic mail, World Wide Web We have discussed multimedia applications We have discussed infrastructure services Domain Name Services (DNS) We have discussed overlay networks Routing overlay, End-system multicast, Peer-to-peer networks We have discussed content distributio...

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