Cisco Cisco IOS Software Release 12.2(33)SRE
Glossary
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Cisco IOS Release 12.2(33)SRB
SSL—Secure Socket Layer. Encryption technology for the web used to provide secure transactions such
as the transmission of credit card numbers for e-commerce.
as the transmission of credit card numbers for e-commerce.
stateful backup—Redundancy scheme that enables IOS SLB to incrementally backup its
load-balancing decisions, or “keep state,” between primary and backup switches. See also active standby
and stateless backup.
load-balancing decisions, or “keep state,” between primary and backup switches. See also active standby
and stateless backup.
stateless backup—Redundancy scheme that provides high network availability by routing IP flows from
hosts on Ethernet networks without relying on the availability of a single Layer 3 switch. See also active
standby and stateful backup.
hosts on Ethernet networks without relying on the availability of a single Layer 3 switch. See also active
standby and stateful backup.
sticky connections—Load-balancing scheme in which new connections from a client IP address or
subnet are assigned to the same real server (for server load balancing) or firewall (for firewall load
balancing) as were previous connections from that address or subnet.
subnet are assigned to the same real server (for server load balancing) or firewall (for firewall load
balancing) as were previous connections from that address or subnet.
Virtual Private Network—See VPN.
virtual server—Presents a single address that represents an application server farm to clients.
VPN—Virtual Private Network. Private network that uses the Internet to connect some nodes.
WAP—Wireless Application Protocol. Suite of protocols used to deliver services to wireless devices.
weighted least connection—Load-balancing algorithm in which the next real server chosen for a new
connection to the virtual server is the server with the fewest active connections. Each real server is
assigned a weight, n, that represents its capacity to handle connections, as compared to the other real
servers associated with the virtual server. The server with the fewest connections is based on the number
of active connections on each server, and on the relative capacity of each server. The capacity of a given
real server is calculated as the assigned weight of that server divided by the sum of the assigned weights
of all of the real servers associated with that virtual server, or n
connection to the virtual server is the server with the fewest active connections. Each real server is
assigned a weight, n, that represents its capacity to handle connections, as compared to the other real
servers associated with the virtual server. The server with the fewest connections is based on the number
of active connections on each server, and on the relative capacity of each server. The capacity of a given
real server is calculated as the assigned weight of that server divided by the sum of the assigned weights
of all of the real servers associated with that virtual server, or n
1
/(n
1
+n
2
+n
3
...).
weighted round robin—Load-balancing algorithm in which the real server used for a new connection
to the virtual server is chosen in a circular fashion. Each real server is assigned a weight, n, that
represents its capacity to handle connections, as compared to the other real servers associated with the
virtual server. New connections are assigned to a given real server n times before the next real server in
the list is chosen.
to the virtual server is chosen in a circular fashion. Each real server is assigned a weight, n, that
represents its capacity to handle connections, as compared to the other real servers associated with the
virtual server. New connections are assigned to a given real server n times before the next real server in
the list is chosen.
Wireless Application Protocol—See WAP.
Wireless Session Protocol—See WSP.
Wireless Transaction Protocol—See WTP.
Wireless Transport Security Layer—See WTLS.
workload agents—Value-added software components developed for specific platforms by third-party
developers. Workload agents run on server platforms or on platforms that manage server farms.
Workload agents deliver server and application information to the services manager. This information
enables the services manager to make optimum server selection.
developers. Workload agents run on server platforms or on platforms that manage server farms.
Workload agents deliver server and application information to the services manager. This information
enables the services manager to make optimum server selection.
WSP—Wireless Session Protocol. Session-layer protocol of the WAP suite.
WTLS—Wireless Transport Security Layer. Layer that provides security between WAP clients and WAP
gateways.
gateways.
WTP—Wireless Transaction Protocol. Transaction-layer protocol of the WAP suite.