Hierarchical Topology Design

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Topology Design Topology is a map of an___________

that indicates network segments, interconnection points, and user communities.

Show the ___________ of the network. ______ step in the logical design

phase. Performed before selecting ________

products or technologies.

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Network Design Model Mesh

The net topology is ____; all routers perform essentially the _____ functions, and there is usually __ clear definition of where specific functions are performed.

Hierarchical. The network is organized in _____ that

each have one or more specific functions.

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Mesh Design Problem Too many CPU adjacencies.

Too many ________. CPU workload required for routers to

communicate with many other _____s and process _______________.

______ to optimize, troubleshoot, and upgrade.

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Mesh Topology

Partial Mesh Full Mesh

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Flat Loop Topology Hierarchical Redundant Topology

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A Partial-Mesh Hierarchical Design

Headquarters(Core Layer)

RegionalOffice(Distribution Layer)

Branch Offices (Access Layer)

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Benefit of Hierarchical Design Scalability –

Networks can grow much larger without sacrificing control or manageability because functionality is _________ and potential problems can be _______ more easily. E.g., PSTN

Ease of implementation – Clear functionality at _________, thereby making network

implementation easier. Ease of troubleshooting –

The functions of the individual layers are well defined, and thus _________ of problems in the network is less complicated.

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Benefit of Hierarchical Design (cont.) Predictability –

The ________ of a network using functional layers is fairly predictable, which makes ___________ for growth considerably easier..

Protocol support – The ________ of current and future applications and

protocols is much easier on networks that follow the principles of _________ design because the underlying infrastructure is already ___________ organized.

Manageability – All the benefits listed here contribute to greater

manageability of the network.

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Functional Layers in Hierarchical network design Core layer

Provides optimal _________ between sites 

Distribution layer Provides _________-based connectivity

Access layer Provides _______ and _____ access to

the network

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Redundant Path

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Core Layer Use routing features that optimize

packet _____________. Avoid using _________ or other

features that __________ the manipulation of packets.

Optimize for __________ and good manageability.

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Distribution Layer Include functions such as :

Address or area __________ __________ or workgroup access to the

core layer __________/_________ domain definition _________ LAN (VLAN) routing Any_______ transitions that need to occur Security

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Access-Layer Functions _________ bandwidth __________ bandwidth MAC-layer filtering _____segmentation

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Guidelines for Hierarchical Network Design Control the _________ of a

hierarchical enterprise network topology. Provide low and predicable _________ Predict routing path, ________, and

___________ requirement. Make troubleshooting and network

documentation easier.

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Guidelines (cont.) Strict control of network topology

at the access layer should be maintained. Avoid adding a ______ and Avoid ________ Core layer

DistributionLayer

Access Layer

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Guidelines (cont.) Design the __________ first.

More accurately perform _______ planning for the distribution and core layer.

Design each layer using ________ and hierarchical techniques and then plan the interconnections between layers based on your analysis of _________.

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Redundant Network Design Topologies

Meet requirements for network availability by _______ network links and interconnectivity devices. ________ paths _________________

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Each site mainly access its local ________.

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WANLink

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Traffic only Goes Up to Where Is ___________

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