CCNA3 Exploration Chapter 1. Study questions.
What are the three layers of the hierarchical network design model?
Access, distribution, core
Access, distribution and core.
What are the advantages of designing LANs using the hierarchical model?
Separates out different functions of a network. This would make it easier to manage, troubleshoot, and expand. Seperates out different functions of a network.The hierarchical model separates out different functions of a network, giving a modular design. This should make the network easier to manage and troubleshoot. It should be easier to expand the network (scalability), and it should be easier to maximise What is the purpose of the access layer?
Allows end device to connect to network and controls which devices connect. It allows end devices to connect to the network and controls which devices may connect.
What sort of devices are found at the access layer?
Computers, printers, routers, switches, hubs, ip phones
End devices, such as PCs, printers, and IP phones. Network devices such as routers, switches, bridges, hubs, and wireless access points.
What is the purpose of the distribution layer?
It controls the flow of the network traffic.
It controls the flow of network traffic. In particular, it controls traffic between different broadcast domains (subnetworks, VLANs). It aggregates traffic from the access layer that needs to be passed to the core layer for longer distance transmission.
What sort of devices are found at the distribution layer?
High performances switches.
High-performance switches. They should have high availability and redundancy to ensure reliability
What is the purpose of the core layer?
High speed backbone that forwards large amount of data quickly
It is the high speed backbone of the network. Its main task is to forward large amounts of data quickly.
What is a collapsed core model and where might it be used?
The distribution layer and the core layer are combines. Small networks.
The distribution layer and the core layer are combined. It is used for smaller networks.
What is a wiring closet?
A room that holds network devices. It is a central point where network cabling comes together.
A room designed to hold network devices such as switches and routers. It is a central point where network cabling comes together.
Why is it not easy to see the logical hierarchical design of a network when looking at the network layout in a building?
Devices operating at different layers may not be physically separated.
The devices operating at different layers may not be physically separated. For example, switches operating at different layers may be kept in the same cabinet.
Why is redundancy important in a network?
Gives availability and reliability
It gives better availability and reliability. If one switch or link goes down then an alternative path can be used.
Which layers normally have redundancy built in?
Core and distribution
Core and distribution layers.
How can the hierarchical design help to give high performance?
Traffic is forwarded through distribution layer and core switches at high speeds and not through lower speed access switches.
Traffic (and particularly long distance traffic) is forwarded through distribution layer and core layer switches that are designed to work at high speeds, and not through a series of lower-speed access layer switches.
How can switches at the different layers contribute to network security? Access – can restrict devices to connect to their ports.
Distribution- can be configured with access control policies that restrict according to IP address. Core- security is not need because they slow things down.
Access layer switches can restrict the devices that are permitted to connect to their ports. Distribution layer devices can be configured with access control policies that restrict traffic according to IP addresses or...
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