ZyXEL Communications XS1920 Series, Руководство пользователя

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Chapter 40 Access Control
XS1920 Series User’s Guide
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The following table describes the labels in this screen.
40.7 Technical Reference
This section provides technical background information on the topics discussed in this chapter.
40.7.1 About SNMP
Simple Network Management Protocol (SNMP) is an application layer protocol used to manage and
monitor TCP/IP-based devices. SNMP is used to exchange management information between the
network management system (NMS) and a network element (NE). A manager station can manage
and monitor the Switch through the network via SNMP version 1 (SNMPv1), SNMP version 2c or
SNMP version 3. The next figure illustrates an SNMP management operation. SNMP is only available
if TCP/IP is configured.
Figure 249
SNMP Management Model
An SNMP managed network consists of two main components: agents and a manager.
Table 184
Management > Access Control > Remote Management
LABEL DESCRIPTION
Entry This is the client set index number. A “client set” is a group of one or more “trusted
computers” from which an administrator may use a service to manage the Switch.
Active Select this check box to activate this secured client set. Clear the check box if you wish to
temporarily disable the set without deleting it.
Start Address
End Address
Configure the IP address range of trusted computers from which you can manage this
Switch.
The Switch checks if the client IP address of a computer requesting a service or protocol
matches the range set here. The Switch immediately disconnects the session if it does not
match.
/FTP/HTTP/
ICMP/SNMP/
HTTPS Select services that may be used for managing the Switch from the specified trusted
computers.
Apply Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Save link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.