Internet Protocols - CCIE Routing and Switching Exam Certification Guide - page 306

TCP Signals Table 6-26

TCP Signal Description

URG Urgent pointer field significant; tells the TCP protocol to look at the urgent pointer

field to indicate the length of urgent data.

ACK Acknowledgement field significant.

PSH Push function; tells the TCP protocol to send the segment immediately.

RST Reset the connection; the station receiving a segment with this flag kills the

session.

FIN No more data from sender; indicates the sender wants to end the connection.

SYN Synchronize the sequence numbers; indicates the first octet sent in the segment.

TCP/IP Protocols and Services Table 6-27

Protocol/Service Description

ARP Converts IP addresses to MAC addresses.

RARP Converts MAC addresses to IP addresses.

Proxy-ARP Router responds to an ARP request with its own MAC address for a

destination in another network.

BOOTP Allows a booting host to configure itself dynamically by obtaining its IP

address, its IP gateway, and other information.

DHCP DHCP server hosts allocate network addresses and deliver configuration

parameters dynamically to hosts.

HSRP Cisco protocol that provides automatic router backup. HSRP allows one

router to assume the function of a second router if the second router fails.

ICMP ICMP operates in the network layer and communicates error messages

between hosts and gateways.

Telnet TCP/IP application-layer protocol that provides remote terminal access.

FTP TCP/IP application-layer protocol that provides file transfer services reliably

using TCP.

TFTP TCP/IP application-layer protocol that provides simple file transfer using

UDP.

DNS TCP/IP application-layer protocol that provides a domain name to IP address

resolution. DNS is a distributed database of separately administrated
domains.

SNMP SNMP is a network protocol for the management of network devices.

NAT NAT devices convert internal IP address space into globally unique IP

addresses.