300-420 Question 213
Select 2An enterprise network is connected to a single Internet Service Provider (ISP) using a single physical link. The company wants to ensure high availability and redundancy while maintaining simplicity in their configuration. Which of the following design considerations should be implemented in this single-homed topology?
- A
Implement static routing between the enterprise network and the ISP.
- B
Configure a dynamic routing protocol like BGP with the ISP.
- C
Use link aggregation (e.g., EtherChannel) to combine multiple physical links to the ISP.
- D
Apply SLA monitoring to detect link failure and trigger failover mechanisms.
- E
Deploy a second ISP connection to create a multi-homed environment.
Show answer and explanation
Correct answers: A, D
Explanation
In a single-homed topology, static routing is preferred for simplicity, and SLA monitoring is essential for detecting link failures and ensuring the single connection to the ISP remains operational. Other options, such as BGP or deploying a second ISP, introduce unnecessary complexity or alter the topology.
- A. Correct.
Static routing is appropriate for single-homed topologies as it is simple to configure and does not require complex routing protocols like BGP.
- B. Incorrect.
BGP is typically used in multi-homed environments with multiple ISPs or complex routing requirements. It is unnecessary and adds complexity in a single-homed setup.
- C. Incorrect.
Link aggregation requires multiple physical links, which is not applicable in a single-homed topology where there is only one link.
- D. Correct.
SLA monitoring can help detect link failures and trigger alerts or failover actions, which is a good practice even in single-homed setups.
- E. Incorrect.
Deploying a second ISP would change the topology to multi-homed, which is outside the scope of a single-homed design.