SSH and Telnet
You can use the Secure Shell (SSH) server to enable an SSH client to make a secure, encrypted connection
to a Cisco NX-OS device. SSH uses strong encryption for authentication. The SSH server in the Cisco NX-OS
software can interoperate with publicly and commercially available SSH clients.
The SSH client in the Cisco NX-OS software works with publicly and commercially available SSH servers.
The Telnet protocol enables TCP/IP connections to a host. Telnet allows a user at one site to establish a TCP
connection to a login server at another site and then passes the keystrokes from one device to the other. Telnet
can accept either an IP address or a domain name as the remote device address.
IP ACLs
IP ACLs are ordered sets of rules that you can use to filter traffic based on IPv4 information in the Layer 3
header of packets. Each rule specifies a set of conditions that a packet must satisfy to match the rule. When
the Cisco NX-OS software determines that an IP ACL applies to a packet, it tests the packet against the
conditions of all rules. The first match determines whether a packet is permitted or denied, or if there is no
match, the Cisco NX-OS software applies the applicable default rule. The Cisco NX-OS software continues
processing packets that are permitted and drops packets that are denied.
Cisco Nexus 3600 NX-OS Security Configuration Guide, Release 7.x
5
Overview
SSH and Telnet
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