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Questions and Answers
What is the purpose of Link Aggregation in networking?
What is the purpose of Link Aggregation in networking?
Which algorithm can be used for load balancing in EtherChannel?
Which algorithm can be used for load balancing in EtherChannel?
What command can be used to verify the status of an EtherChannel configuration?
What command can be used to verify the status of an EtherChannel configuration?
Which protocol prevents loops in a switched network?
Which protocol prevents loops in a switched network?
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What is a main advantage of Rapid Spanning Tree Protocol (RSTP) over STP?
What is a main advantage of Rapid Spanning Tree Protocol (RSTP) over STP?
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What is one benefit of load balancing?
What is one benefit of load balancing?
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Which configuration method allows traffic distribution across paths with different metrics?
Which configuration method allows traffic distribution across paths with different metrics?
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Which command would be used to initiate unequal-cost load balancing in EIGRP?
Which command would be used to initiate unequal-cost load balancing in EIGRP?
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What is the primary purpose of per-destination load balancing?
What is the primary purpose of per-destination load balancing?
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How does static load balancing differ from dynamic load balancing?
How does static load balancing differ from dynamic load balancing?
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What do EIGRP and RIP have in common regarding load balancing?
What do EIGRP and RIP have in common regarding load balancing?
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Which command would you use to verify the traffic distribution in EIGRP?
Which command would you use to verify the traffic distribution in EIGRP?
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What is an advantage of using per-packet load balancing?
What is an advantage of using per-packet load balancing?
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Study Notes
Load Balancing on Routers
- Load balancing distributes network traffic across multiple paths/links, boosting performance, reliability, and resource usage.
- Benefits include preventing congestion, improving network redundancy, and enhancing fault tolerance.
Static Load Balancing
- Manually configures multiple static routes to the same destination with equal costs.
- Example command:
ip route 192.168.1.0 255.255.255.0 10.0.0.1andip route 192.168.1.0 255.255.255.0 10.0.0.2.
Dynamic Load Balancing
- Achieved through dynamic routing protocols like EIGRP and OSPF/RIP.
- EIGRP supports unequal-cost load balancing.
- OSPF/RIP support equal-cost load balancing.
Configuring Unequal-Cost Load Balancing (EIGRP)
- Distributes traffic across paths with varying metrics using the
variancecommand. - Steps:
- Identify feasible successors.
- Configure variance (e.g.,
router eigrp 100 variance <value>). - Adjust traffic to distribute based on path reliability.
Verifying Load Balancing
- Verify by checking the routing table.
Load Balancing Techniques (Per-Packet, Per-Destination, Unequal-Cost, Weighted)
-
Per-Packet: Distributes packets in a round-robin manner, suitable for environments with negligible latency differences between paths. (e.g.,
ip load-sharing per-packet). - Per-Destination: Routes packets from the same source to the same destination along the same path (consistent paths, preventing out-of-order delivery).
- Unequal-Cost: Supported by EIGRP; allows traffic to be split amongst paths with varying metrics.
- Weighted: Traffic is proportionately distributed based on path weights or bandwidth metrics.
Load Balancing on Switches
-
Distributes traffic across multiple interfaces in a switched network.
-
Benefits include performance enhancement and redundancy support.
-
Link Aggregation(EtherChannel): Combines multiple physical links to form a single logical link that improves throughput and redundancy.
- Configuration Steps:
- Identify and bundle interfaces.
- Configure the logical interface.
- Configuration Steps:
-
Load Balancing Algorithm: Uses algorithms such as Source MAC, destination MAC, Source IP, destination IP to distribute the traffic workload. Specific configurations for load-balancing are possible ( e.g.,
port-channel load-balance src-dst-ip).
Verifying Configuration
- Spanning Tree Protocol (STP): Prevents loops in switched networks by blocking certain links to ensure fault tolerance; Rapid Spanning Tree Protocol (RSTP) improves STP convergence time.
- Hot Standby Router Protocol (HSRP): A Cisco proprietary protocol that provides gateway redundancy.
- Gateway Load Balancing Protocol (GLBP): Distributes traffic across multiple gateways for load balancing and redundancy.
- Link Aggregation Control Protocol (LACP): An open standard protocol for link aggregation, utilizing similar steps to EtherChannel.
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Description
This quiz explores the concepts of load balancing in networking, focusing on both static and dynamic methods. It covers the benefits of load balancing, including network redundancy and fault tolerance, as well as specific configurations for EIGRP. Test your understanding of how to optimize network performance!
