May 2009
Intermediate to advanced
882 pages
22h 55m
English
Content preview from Cisco® Network Professional's: Advanced Internetworking Guide
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13.3. Securing Management Functions
Several network management protocols are available, including:
Simple Network Management Protocol (SNMP)
Syslog
Trivial File Transfer Protocol (TFTP)
Network Time Protocol (NTP)
13.3.1. SNMP
SNMP is a network management protocol that can be used to retrieve information from a network device (commonly referred to as read-only access) or to remotely configure parameters on the device (commonly referred to as read-write access). Both SNMP version 1 and version 2 use passwords (called community strings) within each message, as a very simple form of security. Unfortunately, SNMP v1/v2 devices send the community string in clear text along with the message. Therefore, SNMP v1/v2 messages may be intercepted by anyone ...
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