Ccna3 Chapter 1

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An enterprise (large) network must support the exchange of various types of network traffic, including:

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data files, email, IP telephony, and video applications for multiple business units.

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All enterprise networks must:

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Support critical applications

Support converged network traffic

Support diverse business needs

Provide centralized administrative control

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The access layer

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provides connectivity for the users.

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The distribution layer

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is used to forward traffic from one local network to another.

Front 5

The core layer represents

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a high-speed backbone layer between dispersed networks.

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In a two-tier hierarchical design, the core and distribution layers are

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collapsed into one layer, reducing cost and complexity.

Front 7

Enterprise Campus consists of the entire

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consists of the entire campus infrastructure, to include the access, distribution, and core layers.

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Enterprise Edge consists of the

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Internet, VPN, and WAN modules connecting the enterprise with the service provider's network.

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Service Provider Edge provides

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Internet, Public Switched Telephone Network (PSTN), and WAN services.

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A failure domain is the area of a network that is impacted when a

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critical device or network service experiences problems.

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It is easiest and usually least expensive to control the size of a failure domain in the

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distribution layer.

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Switch Block Deployment

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routers, or multilayer switches, are usually deployed in pairs, with access layer switches evenly divided between them.

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Planning for Redundancy:

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Installing duplicate equipment

Installing duplicate paths (may cause loops)

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STP is an open standard protocol, used in a

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is an open standard protocol, used in a switched environment to create a loop-free logical topology.

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There are five categories of switches for enterprise networks:

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Campus LAN Switches, Cloud-Managed Switches, Data Center Switches, Service Provider SwitchesVirtual Networking

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Switch Considerations:

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Cost

Port Density

Power

Reliability

Port Speed

Frame Buffers

Scalability

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The port density of a switch refers to

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the number of ports available on a single switch.

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Fixed configuration switches typically support up to

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48 ports on a single device. Modular switches can support very high-port densities.

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Data rates can be

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100 Mb/s, 1 Gb/s, 10 Gb/s, or 100 Gb/s.

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PoE allows the switch to

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deliver power to a device over the existing Ethernet cabling.

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Multilayer switches are typically deployed in the

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core and distribution layers.

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Multilayer switches are characterized by their ability to

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build a routing table, support a few routing protocols, and forward IP packets.

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ASICs

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Application-specific integrated circuits

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Routers beneficial functions:

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Provide broadcast containment, Connect remote locations, Group users logically by application or department, Provide enhanced security

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There are three categories of routers:

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Branch Routers

Network Edge Routers

Service Provider Routers

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Branch Routers optimize branch services on a

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single platform while delivering an optimal application experience across branch.

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Network Edge Routers enable the network edge to

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deliver high-performance, highly secure, and reliable services.

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Service Provider Routers deliver

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deliver end-to-end scalable solutions and subscriber-aware services.

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Routers come with a variety of different interfaces, such as

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Fast Ethernet, Gigabit Ethernet, Serial, and Fiber-Optic.

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IOS refers to the

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package of routing, switching, security, and other internetworking technologies.

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When a new device is shipped, it comes preinstalled with the

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software image.

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Out-of-band management is used for

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initial configuration or when a network connection is unavailable.

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Out-of-band management requires

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Direct connection to console or AUX port

Terminal emulation client

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In-band management is used to

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monitor and make configuration changes to a network device over a network connection.

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In-band management requires

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At least one network interface on the device to be connected and operational.

Telnet, SSH, or HTTP to access a Cisco device.