Which three of the following network features are methods used to achieve high availability? (Choose three)
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:
1. per-VLAN Spanning Tree (PVST) using Cisco’s InterSwitch Link (ISL) and 802.1Q VLAN Trunking
2. Cisco Spanning Tree Enhancements, including UplinkFast and PortFast
3. Cisco Hot Standby Router Protocol (HSRP) and HSRP Track
4. Cisco IOS per-destination load balancing over equal cost OSPF paths
5. Cisco IOS fast convergence for OSPF
Reference:
http://www.cisco.com/warp/public/779/largeent/learn/technologies/campuslan.pdf