350-401 Question 15
Select 2An enterprise network is using a pair of Cisco Catalyst switches configured in a high availability design. The network administrator wants to ensure minimal downtime during a supervisor engine failure while maintaining redundancy for gateway functionality. Which combination of techniques should the administrator implement?
- A
Configure Hot Standby Router Protocol (HSRP) for gateway redundancy.
- B
Enable Stateful Switchover (SSO) on the Catalyst switches.
- C
Implement Virtual Router Redundancy Protocol (VRRP) instead of HSRP.
- D
Enable Bidirectional Forwarding Detection (BFD) for faster link failure detection.
- E
Configure GLBP (Gateway Load Balancing Protocol) for gateway redundancy.
Show answer and explanation
Correct answers: A, B
Explanation
To achieve high availability in this scenario, HSRP provides gateway redundancy, ensuring traffic can still be routed if one switch fails. SSO ensures minimal downtime by allowing seamless failover between supervisor engines within a switch. While other options like VRRP and GLBP also offer redundancy, HSRP is more commonly used in Cisco environments, and GLBP's load-balancing capabilities are not required here. BFD is a complementary technique but does not directly address the core requirements of this scenario.
- A. Correct.
HSRP is a First Hop Redundancy Protocol (FHRP) that provides gateway redundancy, ensuring the network remains reachable in case of a failure of the primary switch.
- B. Correct.
SSO allows for seamless failover between supervisor engines within the same switch, minimizing downtime during a failure. This is critical for high availability.
- C. Incorrect.
VRRP is another FHRP option, but it is not specific to the scenario described, as HSRP is already mentioned and is more commonly used in Cisco environments.
- D. Incorrect.
BFD is used to detect link failures quickly but does not directly address gateway redundancy or supervisor engine failover.
- E. Incorrect.
GLBP provides load balancing in addition to redundancy, but it is not required for this scenario where minimal downtime and redundancy are the primary goals.