350-401 Question 13
Single answerYour organization has deployed a redundant design using two core routers in a high-availability setup. To ensure seamless failover and avoid manual intervention during a router failure, which high-availability technique would best meet these requirements?
- A
Implement Stateful Switch Over (SSO) between the core routers
- B
Deploy a First Hop Redundancy Protocol (FHRP) such as HSRP or VRRP
- C
Use Equal-Cost Multi-Path (ECMP) routing across both routers
- D
Configure static routes with administrative distance for failover
Show answer and explanation
Correct answer: B
Explanation
To meet the requirement for seamless failover in a redundant high-availability setup, a First Hop Redundancy Protocol (FHRP) such as HSRP or VRRP is the most appropriate solution. FHRP creates a virtual gateway shared by the routers, enabling automatic failover if the active router goes down. Other options either do not provide the required functionality or are not suited for this scenario.
- A. Incorrect.
SSO is used to synchronize state information between supervisors within the same chassis (e.g., in modular switches), not between separate routers. It does not apply to this scenario.
- B. Correct.
FHRP, such as HSRP or VRRP, allows for automatic failover between routers by creating a virtual gateway. This ensures seamless failover and meets the requirements described in the scenario.
- C. Incorrect.
ECMP enables load balancing across multiple paths but does not provide a mechanism for automatic failover or a virtual gateway, which are critical in this scenario.
- D. Incorrect.
Static routes with administrative distance can provide basic failover capabilities but require manual configuration and do not ensure seamless, automatic failover as described in the requirements.