
vi 114071 Rev. A
Starting Telnet ................................................................................................................1-4
Creating Telnet on the Router ..................................................................................1-4
Deleting Telnet from the Router ...............................................................................1-5
Customizing Telnet ...................................................................................................1-5
Starting NTP ...................................................................................................................1-5
Creating NTP on the Router .....................................................................................1-5
Deleting NTP from the Router ..................................................................................1-6
Customizing NTP .....................................................................................................1-6
Where to Go Next ...........................................................................................................1-6
Chapter 2
TCP, FTP, Telnet, and NTP Concepts
TCP Overview ................................................................................................................2-1
How TCP Works .......................................................................................................2-2
TCP Features ...........................................................................................................2-2
Connection Types ..............................................................................................2-4
Connections and Connection States .................................................................2-4
TCP Memory Considerations ............................................................................2-5
TCP and IP Service Users .......................................................................................2-6
FTP Overview .................................................................................................................2-7
How FTP Works .......................................................................................................2-8
Telnet Overview ............................................................................................................2-10
How Telnet Works ..................................................................................................2-11
Telnet Server ...................................................................................................2-11
Telnet Client .....................................................................................................2-12
NTP Overview ..............................................................................................................2-13
NTP Architecture ..........................................................................................................2-13
Distributing Time Throughout the NTP Network ....................................................2-14
Synchronizing with the Best Available Time Server ...............................................2-15
NTP Client Modes ..................................................................................................2-15
Unicast Client Mode ...............................................................................................2-15
Broadcast and Multicast Client Mode .....................................................................2-16
Where to Go Next .........................................................................................................2-17
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