https://prefer-all.tistory.com/30
[컴퓨터네트웍] packet delay, traceroute program, throughput
https://prefer-all.tistory.com/29 Packet Delay : packet이 router buffer에서 대기(queue) 중이기 때문에 발생 - Real internet delays and routes traceroute program: provides delay measurement f..
prefer-all.tistory.com
1. Bad guys:
(1) packet interception
#promiscuous: 자기에 맞는 packet이면 허용, 아니면 버림
(2) fake identity
(3) denial of service
2. defense
(1) authentication 인증: cellular network는 SIM card를 통해 hardware identity 증명
(2) confidentiality : via encryption 암호화
(3) integrity checks : receiver이 받았을 때 sender가 보낸 original form이라는 것을 어떻게 아는가
digital signatures가 tampering변조 예방 및 감지
(4) access restrictions: 익명 user 못 쓰게 / password-protected VPNs
(5) firewalls 방화벽: specialized “middleboxes” / off-by-default: filter incoming packets
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