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Where is the recommended placement of the Layer 3 boundary in a modern enterprise campus network?
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Where is the recommended placement of the Layer 3 boundary in a modern enterprise campus network?
At the access layer
At the distribution layer
At the core layer
Outside the network
Correct answer
At the distribution layer
Placing the Layer 3 boundary at the distribution layer is recommended because it allows for efficient routing and scalability while simplifying network management and fault isolation.
Which of the following is a key consideration when designing a Layer 2 topology for a campus network?
Spanning Tree Protocol (STP)
IP addressing scheme
BGP route reflectors
GRE tunnels
Correct answer
Spanning Tree Protocol (STP)
Spanning Tree Protocol (STP) is crucial in a Layer 2 topology to prevent loops and ensure network redundancy and stability.
What is a primary benefit of implementing a Layer 3 access layer in a campus network design?
Simplified VLAN configuration
Centralized management
Improved IP multicast support
Enhanced redundancy and failover
Correct answer
Enhanced redundancy and failover
A Layer 3 access layer enhances redundancy and failover capabilities by reducing the dependency on STP and allowing faster convergence.
Which design principle helps to minimize broadcast domains in a campus network?
Using large VLANs across the network
Placing Layer 3 boundaries at the access layer
Deploying a flat Layer 2 network
Extending Layer 2 domains across multiple sites
Correct answer
Placing Layer 3 boundaries at the access layer
Placing Layer 3 boundaries at the access layer helps to minimize broadcast domains, improving network performance and manageability.
Which feature should be implemented to prevent loops in a Layer 2 network?
STP
OSPF
HSRP
BGP
Correct answer
STP
Spanning Tree Protocol (STP) is designed to prevent loops in Layer 2 networks by blocking redundant paths until they are needed for failover.
Mr. Johnson is tasked with designing the campus network for a new office building. The building has three floors with multiple departments on each floor. Where should he place the Layer 3 boundary to ensure optimal performance and manageability?
At the core layer
At the access layer
At the distribution layer
Between each floor
Correct answer
At the distribution layer
Placing the Layer 3 boundary at the distribution layer allows for better routing performance, scalability, and fault isolation, making it the optimal choice for a multi-floor office building.
Ms. Lee is redesigning the campus network to improve convergence times and redundancy. She is considering implementing Layer 3 at the access layer. What advantage will this provide?
Reduced number of VLANs
Simplified STP configuration
Faster convergence times and improved redundancy
Easier IP addressing
Correct answer
Faster convergence times and improved redundancy
Implementing Layer 3 at the access layer reduces the reliance on STP, leading to faster convergence times and improved redundancy.
Which metric components does EIGRP use to calculate its composite metric by default?
Bandwidth and delay
Hop count and bandwidth
Delay and MTU
Bandwidth and reliability
Correct answer
Bandwidth and delay
EIGRP uses bandwidth and delay by default to calculate its composite metric, which determines the best path to a destination.
What is the purpose of the EIGRP feasibility condition?
To ensure loop-free paths
To determine the best path
To calculate the composite metric
To establish neighbor relationships
Correct answer
To ensure loop-free paths
The feasibility condition in EIGRP ensures that only loop-free paths are selected as feasible successors by comparing advertised distances.
How does EIGRP maintain information about all its known routes?
In the routing table
In the neighbor table
In the adjacency table
In the topology table
Correct answer
In the topology table
EIGRP maintains information about all known routes in the topology table, which includes details about all learned routes and their metrics.
Mr. Davis needs to configure EIGRP on a network with multiple paths to the same destination. How can he ensure that the paths with lower delay are preferred?
Adjust the K-values
Modify the bandwidth settings
Set up route maps
Use administrative distance
Correct answer
Adjust the K-values
Adjusting the K-values in EIGRP allows Mr. Davis to influence the composite metric calculation, prioritizing paths with lower delay.
Ms. Clark is troubleshooting an EIGRP network and notices suboptimal routing. She suspects a misconfigured EIGRP metric. What should she verify to diagnose the issue?
Bandwidth and delay settings on interfaces
STP configuration
IP address assignments
Access control lists
Correct answer
Bandwidth and delay settings on interfaces
Ms. Clark is troubleshooting an EIGRP network and notices suboptimal routing. She suspects a misconfigured EIGRP metric. What should she verify to diagnose the issue?
Which type of OSPF router connects an OSPF area to the backbone area (Area 0)?
Internal router
Autonomous System Boundary Router (ASBR)
Area Border Router (ABR)
Designated Router (DR)
Correct answer
Area Border Router (ABR)
An Area Border Router (ABR) connects an OSPF area to the backbone area (Area 0), facilitating inter-area routing.
What is the function of OSPF Hello packets?
To establish and maintain neighbor relationships
To exchange routing information
To authenticate OSPF neighbors
To calculate the shortest path
Correct answer
To establish and maintain neighbor relationships
OSPF Hello packets are used to establish and maintain neighbor relationships, ensuring routers can communicate and exchange routing information.
Which OSPF area type is designed to prevent the flooding of external LSAs?
Backbone area
Transit area
Not-so-stubby area (NSSA)
Stub area
Correct answer
Stub area
A stub area in OSPF is designed to prevent the flooding of external LSAs, reducing the amount of routing information within the area and simplifying routing.
Mr. Green is configuring OSPF in a multi-area network and needs to ensure that one of the areas does not receive external LSAs. What type of area should he configure?
Backbone area
Stub area
NSSA
Totally stubby area
Correct answer
Stub area
Configuring a stub area prevents the flooding of external LSAs into that area, reducing routing overhead and simplifying the routing table for routers within the area.
What is the primary advantage of placing the Layer 3 boundary at the access layer in a campus network?
Simplifies VLAN configuration
Enhances routing performance across the core
Improves the security of core devices
Reduces the size of the broadcast domain
Correct answer
Reduces the size of the broadcast domain
Placing the Layer 3 boundary at the access layer reduces the size of the broadcast domain, limiting the broadcast traffic to smaller segments and improving network performance.
Which of the following is a key design consideration for Layer 2 in an enterprise campus network?
Routing protocol selection
IP addressing scheme
Spanning Tree Protocol configuration
NAT implementation
Correct answer
Spanning Tree Protocol configuration
Spanning Tree Protocol (STP) configuration is crucial for Layer 2 design to prevent loops and ensure network redundancy and stability.
Mr. Johnson needs to design a campus network where rapid convergence and minimal downtime are crucial. Which Spanning Tree Protocol variant should he use?
PVST+
MSTP
STP
RSTP
Correct answer
RSTP
Rapid Spanning Tree Protocol (RSTP) provides faster convergence compared to traditional STP, making it suitable for networks where rapid convergence and minimal downtime are crucial.
Ms. Smith is designing an enterprise network and wants to ensure optimal VLAN management. Which feature should she prioritize in her Layer 2 design?
VLAN Trunking
Link Aggregation
VTP
IGMP Snooping
Correct answer
VLAN Trunking
VLAN Trunking allows multiple VLANs to be carried over a single physical link, optimizing VLAN management and improving network efficiency.
What is the main benefit of using OSPF in an enterprise network?
Easy configuration
Low memory usage
Fast convergence and scalability
Compatibility with all routing protocols
Correct answer
Fast convergence and scalability
OSPF (Open Shortest Path First) is known for its fast convergence and scalability, making it ideal for large and complex enterprise networks.
Which type of OSPF area reduces the size of routing tables by blocking external routes?
Backbone area
Stub area
Not-so-stubby area (NSSA)
Totally stubby area
Correct answer
Totally stubby area
A totally stubby area blocks external routes and summary routes, reducing the size of routing tables and improving efficiency.
Mr. Brown is configuring OSPF in a network that requires multiple autonomous systems. Which OSPF feature should he use to manage inter-area routing?
Area Border Routers (ABRs)
Virtual Links
Autonomous System Boundary Routers (ASBRs)
Stub Areas
Correct answer
Area Border Routers (ABRs)
Area Border Routers (ABRs) connect different OSPF areas and manage the routing information between them, essential for inter-area routing.
Ms. Green needs to design an OSPF network that minimizes the impact of topology changes in one area on other areas. Which OSPF area type should she use?
Backbone area
Stub area
Not-so-stubby area (NSSA)
Totally stubby area
Correct answer
Stub area
Stub areas minimize the impact of topology changes by limiting the types of routes advertised, reducing routing complexity and improving stability.
What is a key difference between OSPF and IS-IS in terms of network design?
OSPF supports VLSM, IS-IS does not
IS-IS uses areas, OSPF does not
OSPF is link-state, IS-IS is distance-vector
IS-IS runs directly over the data link layer, while OSPF runs over IP
Correct answer
IS-IS runs directly over the data link layer, while OSPF runs over IP
IS-IS runs directly over the data link layer (Layer 2), making it independent of the underlying IP protocol, unlike OSPF which runs over IP (Layer 3).
Which IS-IS network type has routers that only belong to a single area?
Level-1
Level-2
Level-3
Level-1-2
Correct answer
Level-1
Level-1 routers are only aware of other routers within the same area, making them suitable for intra-area routing.
Mr. White is designing an IS-IS network for an enterprise with multiple geographic locations. Which type of IS-IS routers should he use to interconnect these areas?
Level-1 routers
Level-2 routers
Level-1-2 routers
Backbone routers
Correct answer
Level-2 routers
Level-2 routers interconnect different IS-IS areas and are responsible for routing between them, essential for a network with multiple geographic locations.
Ms. Blue needs to optimize IS-IS for fast convergence in a large network. What should she prioritize in her design?
Increasing Hello intervals
Implementing Level-1-2 routers
Using wide metrics
Reducing SPF calculation frequency
Correct answer
Using wide metrics
Using wide metrics in IS-IS allows for more granular and flexible cost calculations, leading to more efficient path selection and faster convergence.
What is a unique feature of EIGRP compared to other routing protocols?
DUAL (Diffusing Update Algorithm)
Link-state algorithm
Uses cost metric
Runs over UDP
Correct answer
DUAL (Diffusing Update Algorithm)
EIGRP uses the DUAL algorithm to ensure loop-free and efficient path selection, making it unique among routing protocols.
Which metric components does EIGRP use by default to calculate the best path?
Bandwidth and delay
Cost and reliability
Load and hop count
Bandwidth and reliability
Correct answer
Bandwidth and delay
EIGRP uses bandwidth and delay by default to calculate the best path, providing a balanced metric that considers both speed and distance.
Recall the answer before opening each card.
At the distribution layer. This balances routing efficiency, scalability, and fault isolation while simplifying management.
Spanning Tree Protocol (STP). It blocks redundant paths to prevent loops and ensures network stability.
Enhanced redundancy and failover by reducing reliance on STP and allowing faster convergence.
Bandwidth and delay. EIGRP uses these to calculate the composite metric for path selection.
The feasibility condition, which compares advertised distances to ensure feasible successors are loop-free.
In the topology table. It holds information about all learned routes and their metrics.
Adjust the K-values (e.g., set K3=1, K1=0) to influence the composite metric calculation.
Area Border Router (ABR). It routes between areas and injects summary LSAs into the backbone.
To establish and maintain neighbor relationships, ensuring routers can exchange routing information.
Stub area. It blocks Type 5 LSAs, reducing routing overhead and simplifying the routing table.
Totally stubby area. Injects only a default route, minimizing routing table size.
IS-IS runs directly over the data link layer (Layer 2), while OSPF runs over IP (Layer 3).
Level-1 router. It handles intra-area routing and is unaware of other areas.
Level-2 router. It forms the backbone and routes between areas.
Using wide metrics. They allow more granular cost values and efficient path selection.
DUAL (Diffusing Update Algorithm). It ensures loop-free and efficient path selection.
Spanning Tree Protocol configuration to prevent loops and ensure redundancy.
RSTP (Rapid Spanning Tree Protocol). It provides sub-second convergence during topology changes.
VLAN Trunking (802.1Q). It allows multiple VLANs to be carried over one physical link.
Verify bandwidth and delay settings on interfaces, as these are the default metric components.
Read the prompt, commit to an answer, then flip the card. Move through the deck at your own pace and repeat any topic that does not come back quickly.
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Open a branch to connect a topic with its practice questions and explanations. Use the map to choose your next review topic.
This is an analysis of the practice bank, not a claim about the vendor's live exam blueprint. Use it to identify the knowledge, judgment, and recall patterns exercised here, then verify your coverage against the current official exam guide.
The practice bank emphasizes placing the Layer 3 boundary at either the distribution or access layer, each with distinct trade-offs. A distribution-layer boundary balances routing efficiency and broadcast domain size, while an access-layer boundary minimizes broadcast domains but increases routing complexity. For Layer 2 designs, Spanning Tree Protocol (STP) variants such as RSTP are critical for loop prevention and rapid convergence. VLAN trunking optimizes bandwidth by allowing multiple VLANs over a single link. These decisions directly impact network performance and fault isolation.
EIGRP uses bandwidth and delay by default for its composite metric, stored in the topology table alongside all known routes. The feasibility condition ensures loop-free paths by comparing advertised distances. Adjusting K-values allows preference for lower delay, as in Mr. Davis's scenario. Understanding these mechanisms is key to troubleshooting suboptimal routing, like Ms. Clark's issue, where verifying interface bandwidth and delay settings is essential. DUAL (Diffusing Update Algorithm) is EIGRP's unique convergence algorithm.
OSPF uses Hello packets to establish neighbor relationships and relies on ABRs to connect areas to the backbone (Area 0). Stub areas block external LSAs (Type 5), reducing routing table size and improving stability. Totally stubby areas go further by also blocking summary LSAs (Type 3). These area types are ideal for minimizing the impact of topology changes, as Ms. Green's scenario shows. OSPF's fast convergence and scalability make it suitable for large networks.
IS-IS operates at Layer 2, unlike OSPF which runs over IP. Level-1 routers handle intra-area routing, while Level-2 routers interconnect areas. For large enterprises with multiple geographic locations, Level-2 routers are essential. Wide metrics (extended style) allow for more granular cost values, essential for fast convergence in scalable networks. Ms. Blue's design should prioritize wide metrics to efficiently handle modern link speeds and path diversity.
Study workflow
Assess the campus size and redundancy needs. For a multi-floor building like Mr. Johnson's, place the Layer 3 boundary at the distribution layer to balance broadcast domains and routing efficiency. For smaller networks needing minimal broadcast domains, consider the access layer but account for increased routing overhead.
When rapid convergence is critical (Mr. Johnson's scenario), enable RSTP on all switches. RSTP reduces convergence time to seconds by using port roles and proposal-agreement handshakes. Ensure all switches support RSTP and disable legacy STP to avoid incompatibility.
To prioritize paths with lower delay (Mr. Davis's case), adjust EIGRP K-values. By default K1=1 and K3=1. Set K3=0 to ignore delay, or adjust K1 and K3 weights. Use the 'metric weights' command under router EIGRP, and verify with 'show ip eigrp topology'.
To prevent external LSAs (Mr. Green's requirement), configure stub areas. On the ABR, use 'area X stub' command. For totally stubby areas (Ms. Green's scenario), add 'no-summary' to block summary LSAs. Verify with 'show ip ospf database'.
For fast convergence in large networks (Ms. Blue's design), enable wide metrics using 'metric-style wide' under router IS-IS. This allows values up to 2^24-1. Reconfigure all interfaces with appropriate costs and verify with 'show isis interface'.
FAQ
Clear boundaries on what the bank covers, how to use it, and where official vendor information still matters.
A stub area blocks Type 5 external LSAs but allows Type 3 summary LSAs. A totally stubby area blocks both Type 5 and Type 3 LSAs, injecting only a default route. This further reduces the routing table size and limits topology change propagation, ideal for areas with limited routing resources.
DUAL uses the feasibility condition: a path is accepted as a feasible successor only if the reported distance (RD) from the neighbor is less than the current feasible distance (FD). This guarantees that the alternate path does not loop back to the router itself, ensuring loop-free routing.
Place it at the access layer when minimizing broadcast domain size is critical, such as in networks with many end hosts needing fault isolation. Use distribution layer for better scalability and simpler routing, as it aggregates access switches and reduces the number of routing peers.
IS-IS runs directly over the data link layer (Layer 2), making it protocol-independent and able to route IP, IPv6, and other protocols. OSPF runs over IP (Layer 3) and uses IP protocol number 89, so it requires IP connectivity between routers.
RSTP provides faster convergence (typically <1 second) by actively negotiating transitions between port states instead of relying on timers. It also introduces edge and alternate port roles, making it suitable for networks requiring minimal downtime during topology changes, as in Mr. Johnson's design.
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