Wireless Security.pdf - PDF Archive

712 Appendix B
SMTP: Simple Mail Transfer Protocol (SMTP) is used to send e-mail. The SMTP
protocol provides a common language for different servers to send and receive e-mail
messages. The default TCP/IP port for the SMTP protocol is port 25.
SNMP: Simple Network Management Protocol (SNMP) is a protocol used for monitoring
network devices. Devices like printers and routers use SNMP to communicate their status.
Administrators use SNMP to manage the function of various network devices.
Stateful Inspection: Stateful inspection is a more in-depth form of packet filter firewall.
While a packet filter firewall only checks the packet header to determine the source and
destination address and the source and destination ports to verify against its rules, stateful
inspection checks the packet all the way to the Application layer. Stateful inspection
monitors incoming and outgoing packets to determine source, destination, and context.
By ensuring that only requested information is allowed back in, stateful inspection helps
protect against hacker techniques such as IP spoofing and port scanning
TCP: The TCP is a primary part of the TCP/IP set of protocols, which forms the basis
of communications on the Internet. TCP is responsible for breaking large data into
smaller chunks of data called packets. TCP assigns each packet a sequence number and
then passes them on to be transmitted to their destination. Because of how the Internet
is set up, every packet may not take the same path to get to its destination. TCP has the
responsibility at the destination end of reassembling the packets in the correct sequence
and performing error-checking to ensure that the complete data message arrived intact.
TCP/IP: TCP/IP is a suite of protocols that make up the basic framework for
communication on the Internet.
TCP helps control how the larger data is broken down into smaller pieces or packets
for transmission. TCP handles reassembling the packets at the destination end and
performing error-checking to ensure all of the packets arrived properly and were
reassembled in the correct sequence.
IP is used to route the packets to the appropriate destination. The IP manages the
addressing of the packets and tells each router or gateway on the path how and where to
forward the packet to direct it to its proper destination.
Other protocols associated with the TCP/IP suite are UDP and ICMP.
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