VLANs Virtual Local Area Networks BA 479 Who

VLANs Virtual Local Area Networks BA 479

Who are we? ¥ Ryan Winklepleck ¤ Senior, Business, MIS, this ‘boy wonder’ is 21 -years-old and still figuring out post-college life, possibly the circus is hiring? ¥ Kameel Husain ¤ Senior, Business, MIS, would like to work with graphic designs and databases. Likes milk, bones are as strong as antimantium, cage fighter. ¥ Rob Jerand ¤ Senior, Business, MIS, always up for kegstands and dollar beers, enjoys running from the Cops, giving beer cans to the bums, and my future consists of either being a janitor at Microsoft, or live in my parent’s basement and do nothing. ¥ Andrew Grill Jr. III ¤ Bats: R, Throws: R, Avg: . 405, RBI: 132, HR: 59, Triple Crown MVP, after a gamma blast accident, you don’t want to see him when he’s angry. Business, MIS, accounting intern at weyerhaeuser and plans to work there in the future.

VLAN - Brief Introduction Five W’s and an H…

VLAN Introduction ¥ What? ¤ “Networks in which computers are assigned to LAN segments by software rather than by hardware. ” ¥ Who? ¤ Us ¥ Why? ¤ Often faster, while providing greater opportunities to manage the flow of traffic on the LAN and Backbone Network (BN) in comparison to traditional LAN and routed BN architectures.

VLAN Introduction ¥ Where? ¤ Hosting Centers and Ethernet Metropolitan Area Network (MAN) ¥ When? ¤ Due to their complexity, usually only used for large networks. ¥ And the H…

VLAN History Thought it was going to be How?

VLAN History ¥ First Products: Segmentable Switches Allows creation of two or more virtual switches from a single switch. ¤ Assigning individual ports to a specific virtual switch. ¤ First products allowed switching of multiple segments on a single switch, as well as offering a monetary advantage over switched Ethernet ports which cost $700 or more at the time. ¤

VLAN Background However, VLAN Backwards would be NALV…

VLAN Background ¥ Local Area Networks (LAN) Generally defined as a broadcast domain. ¤ “Hubs, bridges, or switches on the same physical segment or segments connect end node devices” ¤ A router is not needed for end nodes on the same LAN segment to communicate with each other. ¤ However a router is necessary for these devices to communicate with devices on other LAN segments. ¤

VLAN Background ¥ To the left, a LAN environment connected by routers ¥ Drawback: ¤ Routers add latency that delays the transmission of data ¤ Solution? ¤ Switched Network

VLAN Background ¥ To the right, a LAN environment connected by switches. ¤ Speed and latency advantages. ¥ Drawback: ¤ All end nodes (or hosts) are in same broadcast domain, which adds to the network a significant amount of traffic that is seen by all hosts. ¤ Solution? ¤ Switched Network w/VLANs

Single-Switch VLAN

Single-Switch VLAN ¥ The VLAN operates only inside one switch. ¥ Computers, dozens or even hundreds, on the VLAN are connected into this switch and assigned by software into different VLAN segments. ¥ VLAN segments act as though they are connected to the same physical switch or hub.

Single-Switch VLAN cont. ¥ It’s possible to have one computer only in a VLAN. (Servers) ¥ Four ways in which computers attached to a VLAN can be assigned to specific VLANs inside them …: Port-based VLANs (layer-1 VLANs) 2. MAC-based VLANs (layer-2 VLANs) 3. IP-based VLANs (layer-3 VLANS) 4. Application-based VLANs (layer-4 or policy -based VLANS) 1.

Port-based VLANs (layer-1 VLANs) ¥ Uses physical layer port number on the front of the VLAN switch to assign computers to VLAN segments. ¥ All computers are physically cabled into a specific port on the VLAN switch. ¥ A software is used to instruct the switch as to which ports are assigned to which VLAN.

MAC-based VLANs (layer-2 VLANs) ¥ Uses data link layer address or physical address to form VLANs. ¥ A software is used to instruct the switch as to which incoming data link layer addresses are assigned to which VLAN segment. ¥ Easier to manage than Port-based.

Multi-Switch VLAN

Multi Switch Approach ¥ Layer 3 ¥ Layer 4 ¥ IEEE 802. 1 Q

Layer 3 ¥ Network layer ¥ serves as the backbone for network traffic going across different VLANs. ¥ provides logical routing interfaces to VLANs on Layer 2 switches. A traditional network requires a physical interface from a router to a switch to perform inter VLAN routing.

Layer 4 ¥ Transport Layer ¥ Decides on where to send the packets. ¥ sends incoming packets to one or more machines which are hidden behind a single IP address.

IEEE 802. 1 Q ¥ allows multiple bridged networks to transparently share the same physical network link without leaking information

VLAN Benefits What is Yreka Bakery spelled backwards?

Benefits ¥ Performance ¤ VLANs can reduce sending traffic to unnecessary destinations ¥ Formation of Virtual Workgroups Segment sections of business (marketing, accounting, etc) by VLAN ¤ Drawback – distance in physical location, centralized server farms ¤ ¥ Simplified Administration ¤ Adding, changing, moving user accounts no new reconfiguration of hubs/routers necessary

Benefits ¥ Reduce Costs ¤ VLANs can be used to create broadcast domains which can eliminate cost of expensive routers ¥ Security Keep information restricted to only users who need access ¤ Can control boadcast domains, set up firewalls and more ¤

VLAN Drawbacks

Drawbacks ¥ Costs Purchasing additional hardware ¤ May need to hire new employee to manage ¤ ¥ Misc. New users may encounter new problems they are not familiar with ¤ If users are located on different floors of a building common resources (such as a printer) could be in inconvenient locations ¤