
Cisco has developed several clients that can be installed on end devices that deliver secure connectivity using [VPN](/vpn) and other security technologies.  The software that has been developed over the years includes:

* [Cisco VPN Client](/security-cisco-vpn-client) - A legacy software offering that supports only [IPSec](/ipsec).
* [Cisco AnyConnect Secure Mobility Client](/security-cisco-anyconnect-secure-mobility-client) - A replacement to the VPN Client, delivering additional support including [SSL](/cisco-anyconnect-ssl-webvpn), and IKEv2.
* [Cisco Secure Client](/security-cisco-secure-client) - This the latest version of AnyConnect.  It is based on AnyConnect but it is different and innovative enough to warrant a new name.  It is built upon Cisco AnyConnect, but delivers a wider range of modular security services.


Links:

https://www.cisco.com/c/en/us/support/security/anyconnect-secure-mobility-client-v4-x/model.html

https://www.cisco.com/c/en/us/products/collateral/security/anyconnect-secure-mobility-client/secure-mobility-client-ds.html

https://www.cisco.com/c/en/us/obsolete/security/cisco-vpn-client.html

Security - Cisco VPN client software

STP - RSTP convergence process

STP - RSTP port roles

STP - RSTP proposal-agreement process

STP - RSTP while timer

STP - Shortest Path Bridging (SPB)

STP - Topology Change Acknowledgement (TCA)

STP - bridge priority

STP - determining the blocked port using port ID

STP - port identification

STP - port roles

STP - port states

STP - what bridge ID does the MST region use

STP - what is a topology change

STP BPDU Filter

STP BPDU Guard

STP BPDU Types

STP BPDU destination MAC address

STP Cost Calculation Methods

STP Loop Guard

STP Max Age

STP Message Age

STP PortFast

STP Portfast Options

STP Root Bridge selection

STP Root Guard

STP Topology Change (TC) flag

STP Topology Change Timer

STP UDLD and Autonegotiation

STP UDLD

STP bridge priority values

STP changing link cost

STP configuring on EtherChannel

STP configuring portfast

STP contents of a BPDU

STP cost long mode

STP cost short mode

STP determining blocked port using cost

STP direct vs indirect link failure

STP fine tuning the spanning tree protocol

STP how a switch identifies a BPDU

STP how to find the root bridge

STP interface type

STP prio nbr value

STP topology change process

Security - 802.1x with WLC and AAA server

Security - Cisco AnyConnect Secure Mobility Client

Security - Cisco Secure Client

Security - Cisco VPN Client

Security - Diffie-Hellman groups

Security - Extensible Authentication Protocol over LAN (EAPOL)

Security - GETVPN

Security - IEEE 802.1X

Security - IOS Usernames and Passwords

Security - IPsec nonce

Security - Kerberos

Security - MAC Authentication Bypass

Security - Network Access Control (NAC)

Security - Secure Unique Device Identifier (SUDI)

Security - WPA 4-way handshake

Security - WebVPN

Security - accessing VTY from another VRF

Security - assigning privilege levels, syntax and behavior

Security - bogons

Security - broadcast-multicast storm

Security - configuring TACACS from another VRF

Security - privilege levels and command output

Security - privilege levels and enable keyword

Security - public key exchange

Security - root CAs and private keys

Security - spoofing

Security - storm control algorithm

Security IKE policy hash command

Security Trusted Platform Module (TPM)

Security aaa new-model

Security authentication on VTY lines

Security keyrings

Segment Routing

Serial Interface default broadcast address

Session Border Controller

Session Initiation Protocol

Show open TCP-UDP ports on Cisco router

Spanning Tree Protocol (STP)

Spine and leaf architecture - connections to leaf switches

Spine and leaf architecture - connections to spine switches

Spine and leaf architecture - reducing latency

Split-horizon

StackWise Virtual

Stackwise election process

Stackwise user priority

Subscriber templating

Summarization

Supernetting

Switch configuring a routed port

Switch high availability options

Switch protected port limitations

Switch protected port

Switching - CEF

Switching - Media Access Control (MAC) addresses