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12 Cards in this Set

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Which function is supplied by the access layer in a three-layer network design?




high-speed connectivity


routing


application of policies


network access


backbone connectivity

network access




The main purpose of devices in the access layer is to supply network access to end users. Distribution layer devices provide services such as routing and policy functions. The core layer provides high-speed backbone connectivity.

The first step a switch does when processing a frame is to see if the source MAC address is in the MAC address table. If the address is not there, the switch adds it. The switch then examines the destination MAC address and compares it to the MAC address table. If the address is in the table, the switch forwards the frame out the corresponding port. If the address is missing from the table, the switch will broadcast the frame to all ports except the port through which the frame arrived.
Store-and-forward switching performs an error check on an incoming frame after receiving the entire frame on the ingress port. Switches which use this method have the flexibility to support any mix of Ethernet speeds. The cut-through method begins the forwarding process after the destination MAC address of an incoming frame is looked up and the egress port has been determined.

Which service is provided by an automated attendant feature on a converged network?




point-to-point video


call routing


IT management interface


video conferencing

call routing




The automated attendant feature increases the speed of voice services by routing calls directly to individuals or departments. Point-to-point video and video conferencing describe video services on a converged network. An IT management interface is part of a converged network solution that allows IT personnel to facilitate moves, adds, and changes through a centralized application.

Which statement is true about broadcast and collision domains?




The size of the collision domain can be reduced by adding hubs to a network.




The more interfaces a router has the larger the resulting broadcast domain.

The more interfaces a router has the larger the resulting broadcast domain.




A switch that receives a broadcast frame will forward the frame out all other interfaces, including interfaces that connect to other switches. These switches will also perform the same forwarding action. By adding more switches to the network, the size of the broadcast domain increases.

When an appropriate switch form factor for a network is being determined, what should be selected when fault tolerance and bandwidth availability are desired but the budget is limited?

modular switch


Stackable switches provide fault tolerance and bandwidth availability by using special cables between switches and are less costly to implement than modular switches. A non-stackable switch does not provide these features. A fixed configuration switch is a single switch that does not support features beyond those that originally came with it. A modular switch usually provides fault tolerance and features for bandwidth availability but is rather costly to implement.

Which switching method describes a switch that transfers a frame as soon as the destination MAC address is read?

cut-through

Which cost-effective physical network topology design is recommended when building a three-tier campus network that connects three buildings?​

extended star




For efficiency, scalability, and cost-effectiveness, building an extended star topology from a centralized site to all other campus sites is recommended. A mesh topology is much more expensive, and bus and dual ring topologies are more difficult to troubleshoot and maintain.

When the appropriate switch form factor for a network is being determined, what type of switch should be selected when future expansion is important and cost is not a limiting factor?

stackable switch




A modular switch provides fault tolerance and features for bandwidth availability and future expansion by using line cards but is rather costly to implement. Stackable switches provide fault tolerance and bandwidth availability by using special cables between the switches and are less costly to implement than modular switches. A nonstackable switch does not provide these features.

The first step a switch does when processing a frame is to see if the source MAC address is in the MAC address table. If the address is not there, the switch adds it.

The switch then examines the destination MAC address and compares it to the MAC address table. If the address is in the table, the switch forwards the frame out the corresponding port. If the address is missing from the table, the switch will forward the frame to all ports except the port through which the frame arrived.

What are the three layers of the switch hierarchical design model?

access


core


distribution

Which two characteristics describe a converged network?



support of voice and video both using the same switch


affordability for small and medium businesses


cheaper equipment cost

support of voice and video both using the same switch




cheaper equipment cost

Which two statements about Layer 2 Ethernet switches are true?



Layer 2 switches have multiple collision domains.


Layer 2 switches decrease the number of broadcast domains.


Layer 2 switches can send traffic based on the destination MAC address.

Layer 2 switches have multiple collision domains.




Layer 2 switches can send traffic based on the destination MAC address.