CS 610 Networking And Security JMU

Internetworking An internetwork is typically comprised of many physical networks over which data travels There are many different types of physical networks: Ethernet FDDI ATM Goals of internetworking: Make all the diverse network technologie

The Transmission Control Protocol (TCP) Application Services (Telnet, FTP, e-mail, WWW) Reliable Stream Transport (TCP) Unreliable Transport Service (UDP) Connectionless Packet Delivery Service (IP) The Transmission Control Protocol (TCP) TCP is a

Overview Network security involves protecting a host (or a group of hosts) connected to a network Many of the same problems as with stand-alone computer systems apply and are more difficult: User authentication and authorization determine the ide

Intrusion Detection Systems We have already discussed: Host-based IDS Example: Tripwire Multihost-based IDSs examine data from a group of hosts Example: NIDES A network-based IDS analyzes network traffic (and possibly data from connected host

Access Control for Networks Problems: Enforce an access control policy Allow trust relationships among machines Protect local internet from outsiders attempting to: Obtain information, modify information, disrupt communications Solution: fire

The Transmission Control Protocol (TCP) TCP is a protocol that specifies: How to distinguish among multiple destinations on a given machine How to initiate and terminate a stream transfer Format of the data and acknowledgments that two computers

The Transmission Control Protocol (TCP) Application Services (Telnet, FTP, e-mail, WWW) Reliable Stream Transport (TCP) Unreliable Transport Service (UDP) Connectionless Packet Delivery Service (IP) The Transmission Control Protocol (TCP) TCP is a

VPN and NAT We have been viewing the Internet as a collection of interconnected networks In reality, many organizations have private internets interconnected by the Internet Organization A\'s private network Internet Organization B\'s private netw

Mapping Between IP and Physical Addresses Today\'s topics: How does a machine learn the physical address for a computer for which it knows the IP address? Example: transmitting a message over a physical network How does a machine learn the IP add