Which three of the following network features are methods used to achieve high availability?
(Select all that apply.)

A.
Spanning Tree Protocol (STP)

B.
Delay reduction

C.
Hot Standby Routing Protocol (HSRP)

D.
Dynamic routing protocols

E.
Quality of Service (QoS)

F.
Jitter management

Explanation:
Because the importance of high availability networks is increasingly being recognized, many
organizations are beginning to make reliability/availability features a key selection criteria for
network infrastructure products. With this in mind, Cisco Systems engaged ZD Tag to
observe and confirm the results of a series of tests demonstrating the high availability
features of Cisco Catalyst Layer 2/Layer 3 switches. In order to maximize the relevance of
the results, the demonstration was based on a model of a “real world” campus (in one of
Cisco’s Enterprise Solution Center labs in San Jose, California).
This switched internetwork consisted of wiring closet, wiring center, and backbone switches
and conformed to Cisco’s modular three-tier (Access/Distribution/Core) design philosophy.
The testing demonstrated the following high availability and resilience features of Catalyst
switches:
per-VLAN Spanning Tree (PVST) using Cisco’s InterSwitch Link (ISL) and 802.1Q VLAN
Trunking
Cisco Spanning Tree Enhancements, including UplinkFast and PortFast
Cisco Hot Standby Router Protocol (HSRP) and HSRP Track
Cisco IOS per-destination load balancing over equal cost OSPF paths
Cisco IOS fast convergence for OSPF
Reference: http://www.cisco.com/warp/public/779/largeent/learn/technologies/campuslan.pdf