교과서 Chapter (1-5 만 배움)

1. Introduction (Computer Networks and Internet)
2. Application Layer (5)
3. Transport Layer (4)
4. Network Layer : The Data Plane (3-1)
5. Network Layer : The Control Plane (3-2)
6. The Link Layer and LANS (2)
7. …

Ch1.

• internet
• protocol
• edge $\ni$ hosts, link, access net, physical media
• core $\ni$ forwarding, routing, packet, ciruit swtiching, internet structure
• performance: loss, delay, throughput
• protocol layer - transport service, service model

Ch2. Application Layer

2.1 network application의 원리
2.2 Web and HTTP
2.3 electronic mail
2.4 DNS
2.5 P2P application
2.6 video streaming and content distribution networks
2.7 socket programming with UDP and TCP

• socket
• HTTP
• RTT (Round-Trip-Time)
• DNS
• SMTP
• POP3
• IMAP
• P2P (Peer-to-peer) protocol
• CDNs (Content Distribution Networks)

Ch3. Transport Layer

3.1 transport-layer services
3.2 multiplexing and demultiplexing
3.3 UDP : connectionless transport
3.4 reliable data transfer의 원리
3.5 TCP : connection-oriented transport
3.6 congestion control의 원리
3.7 TCP congestion control

• Bandwidth : 초당 데이터 전송율
• Multiplexing
• Propagation delay
• Transparency
• Throughput : 초당 비트 수
• Jitter
• Piggybacking
• Flow control
• Congestion control

Ch4. Network Layer : The Data Plane

4.1 Overview of Network Layer
4.2 inside the router
4.3 Internet Protocol
4.4 Generalized Forward and SDN

• Store-and-Forward
• Packet Forwarding : 내부에서 외부로의 패킷 relaying
• Routing : 네트워크에서 best path를 선택하는 과정

Ch5. Network Layer : The Control Plane

5.1 Introduction
5.2 Routing Protocol
5.3 intra-AS routing in the Internet
5.4 routing among the ISPs
5.5 the SDN control plane
5.6 ICMP (the Internet Control Message Protocol)
5.7 Network Management and SNMP

UDP & TCP (4)

UDP : User Deifined Protocol, Connection-less
TCP : Transmission Control Protocol, Connection-oriented
Transport Layer (4) 에서 사용되는 프로토콜

	UDP	TCP
connection	X	O
reliablility	X	O
order	X	O

IP (3)

IP : Internet Protocol
Network Layer (3) 에서 사용되는 프로토콜

intra-AS routing in the Internet: OSPF

Intra-AS Rounting
also known as IGP (Interior Gateway Protocols)

• RIP : Routing Information Protocol
• OSPF : Open Shortest Path First (IS-IS protocol essentially same as OSFP)
• IGRP : Interior Gateway Routing Protocol

OSPF (Open SHortest Path First)

open -> publicly availble
link-state 알고리즘을 사용한다. (route 계산 시 다익스트라 알고리즘 사용)
advanced feautre로는 다음과 같은 것들이 있다.

• security
• integrated uni- and nulti-cast support