1 LAN design- Chapter 1 CCNA Exploration Semester 3 Modified by Profs. Ward and Cappellino

2 Topics Networks and business needs The 3-level hierarchical network design model Including voice and video over IP in the design Devices at each layer of the hierarchy Cisco switches for each layer

3 LAN Switching and Wireless LAN Design- Ch 1Basic Switch Concepts VLANs VTP STP Inter-VLAN routing Wireless

4 Hierarchical design model Hierarchical network design _______________________________ ___________________________________ Makes network _________________________________

5 Hierarchical design model High speed backbone. Must be capable of ___________________________________ Should be ____________________ to ensure reliability

6 Hierarchical design model __________________________________ switches before it is _______________________ for routing to its final destination Should be _________________ to ensure reliability Separate subnets, VLANs, routing, flow control, security.

7 Hierarchical design model Connects end devices to the network. Controls which devices are allowed to communicate. __________________________________ occur here

8 Collapsed core Small networks: merged _____________________

9 Logical and physical layout Logical – _____ _____________ Physical – _____ _____________ in the building Logical connections not obvious from looking.

10 Benefits of Hierarchical Network Scalability – __________________ as network grows Redundancy – at __________________________ Performance – route packets at _________________ between all devices Security – ___________________________ at the access layer ______________________________________________ Manageability – ____________________________ Consistency between the switches at each layer simplifies management Maintainability – modularity allows for network to ________________________________________

11 Design principles Network diameter – _______________________ ______________________________? The ______________________ to decrease latency More to come in later chapter… Bandwidth aggregation – ___________________ ________ between two switches _______________ where high bandwidth is needed. Redundant links/devices – in core and distribution layers. Too _____________ for access. Start design at the access layer. Ask: How many devices, how much bandwidth needed?

12 Converged network _____________________________________ Not converged as in “all routers have consistent information”. Same word used. Needs quality of service (_________) to give _____ __________________________________ Was very expensive, needed expertise, needed to replace legacy equipment. Now ________________________ for small to medium-sized businesses

13 Advantages of converged network ______________________/ keep up to date Decreased cost of management _____________________ and networking devices Less expensive than having three sets of network cabling _______________________ to run it ______________________________ Can have voice and video on employee’s PC using headset, webcam and software – ______________ ________________________

14 Choosing switches Carry out _______________________ using software to _________________________________. Allow for growth. Traffic flow analysis- the process of ___________________ _______________ on a network and analyzing the data for the purpose of performance tuning, capacity planning, etc Carry out ____________________. Group by job function. How many ports? How much bandwidth? Allow for growth. User community analysis- the process of _____________ _______________________________________________ Carry out __________________________________. Traffic to, from, between. consider both client-server traffic and server-server traffic.

15 Topology Diagram Graphical _________________ of a network infrastructure. Ports/switches? Bandwidth? Bottlenecks? Layers? Routes? Redundancy?

16 Topology Diagram Ports/switches? Bandwidth? Bottlenecks? Layers? Routes? Redundancy? Document it now

17 Choosing switches (cont d ) Switch form factors: ___________________ ____________________________ ____________ beyond those that originally came with the switch. _____________________ Different sized chassis that ____________________________ _____________________ ports on cards _________________ ___________________________ Linked by special backplane cables to special ports 1 rack unit (1U)

18 Choosing switches (cont d ) ___________________ – number of ______________ on a single switch Allow for links between switches _________________ – ___________________ of a switch How many Gbps can it process? Can all ports work simultaneously at maximum speed? __________________ determine if there are _____________ on a switch to aggregate if needed Allows up to __________________________________ one, with combined bandwidth ____________________________

19 Choosing switches (cont d ) Power over Ethernet (_____) for IP phones, network access points. Allows the ___________________________ __________________________________ Do you need it? It adds to the cost. ___________________ (aka _____________ switch) needed? Typical switch works at ____________________ uses ________________ addresses. _____________________ also works at ______________ ________________________________.

20 _______ Layer Switch Features __________ – switch decides which devices are allowed to connect to it. Supported by all Cisco switches ___________ – devices located on different subnets. Configurable on Access Layer switches ___________ – Fast Ethernet (100Mbps) or Gigabit. Power over Ethernet (_____) – expensive __________________ – for uplink to distribution layer if needed Quality of service (______) maintains the prioritization of traffic in converged networks

21 _________ Layer Switch Features _________________________________ One VLAN can communicate with another __________________________ (processing) _______________ Gbps/10Gbps Ethernet ports ______________________ for adequate availability ____________________ – access control lists control traffic flow ___________________ ensure adequate bandwidth to accommodate the traffic generated on the access layer provides fault tolerance in case a link is lost. ______________________ maintains the prioritization of traffic from Access layer switches which have implemented QoS _____________________ Multiple hot swappable power supplies recommended

22 _______ Layer Switch Features _____________________________________ Very ____________________________ __________________ Ethernet ports ________________________________ _______________________ support for aggregated 10GbE connections ______________________________ ________________ power supplies and cooling fans NOTE: Avoid applying security and other distractions here. Go for speed.

23 Catalyst Switch product lines

24 Catalyst Switch product lines Concentrate on general features