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Network (Protocol types (Converged protocols: distinct convergeg into one,…
Network
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Remote access
VPN:
PPTP: works at data link layer, can handle one tunnel
L2TP: not only IP but also frame relay,
TLS,
IPSEC: works at network layer, can handle n tunnels
PPP is encapsulated protocol, ideal for connect different types of devices over serial lines
PAP sends credentials in cleartext,
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CHAP authenticates using a challenge/response mechanism and therefore does not send passwords over the network.
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Network types
STP and UTP are twisted pair cabling types, very popular but vulnerable to EMI and RFI
Ethernet uses CSMA/CD, all computers share a cable, listen to learn when they can transmit and are susceètible to data collisions.
IPSec tunnel mode protects the payload and header information of a packet, while IPSec transport mode protects only the payload.
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OSI
PDNTSPA
Lightweight EAP (Cisco) : first implementation for EAP / 802.1X
Uses preshared keys and MS-CHAP to authenticate
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Physical: bits
Data link: frame
Network: Datagram
Transport: E2E connection
Session: session
Presentation: encryption, compressing, formatting
Application: message
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