Netværkssikkerhed

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Port numbers • 16 bit integer (unsigned) • Well Known Ports: 0 - 1023. • Registered Ports: 1024 - 49151 • Dynamic and/or Private Ports: 49152 - 65535 • Eksempler (TCP porte): —daytime 13/tcp Daytime (RFC 867) —ftp-data 20/tcp File Transfer [Default Data] —ftp 21/tcp File Transfer [Control] —ssh 22/tcp SSH Remote Login Protocol —telnet 23/tcp Telnet —smtp 25/tcp Simple Mail Transfer —http 80/tcp World Wide Web HTTP 09/10/2012 ITU 7.10
UDP-header Connection less Transportlaget TCP/UDP headers TCP-header Connection oriented 09/10/2012 ITU 7.11
Page 1 and 2: Netværkssikkerhed Netv rkssikkerhe
Page 3 and 4: Netværksterminologi Computing syst
Page 5 and 6: Transmissionsmedier • Kobber (wir
Page 7 and 8: ping application ICMP IGMP DHCP TCP
Page 9: Applikationslaget HELO itu.dk MAIL
Page 13 and 14: IP - Netværkslaget • Notation 19
Page 15 and 16: LAN Header Transceiver Frames Netwo
Page 17 and 18: Trusler og sårbarheder • Sniffin
Page 19 and 20: Mulige modmidler • Boundary Contr
Page 21 and 22: IEEE 802.1q 12 bits til VLAN, dvs,
Page 23 and 24: Firewall komponenter • Sikkerheds
Page 25 and 26: Felter for filtrering (TCP/IP) TYPI
Page 27 and 28: Packet filtering firewall system
Page 29 and 30: Screened subnet firewall system 09/
Page 31 and 32: Personal firewalls • Installeres
Page 33 and 34: Dual home firewall iptables - eksem
Page 35 and 36: Intrusion detection systemer (IDS)
Page 37 and 38: TCP/IP suite Application layer Tran
Page 39 and 40: IPSEC (IP-security) • Kan både a
Page 41 and 42: IPSEC headers • Authentication He
Page 43 and 44: Transport mode AH in IP Tunnel mode
Page 45 and 46: • ISAKMP Key distribution (Intern

Netværkssikkerhed

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