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Exploring the Enterprise Network Infrastructure

Exploring the Enterprise Network Infrastructure. Introducing Routing and Switching in the Enterprise – Chapter 2. Objectives. Interpret network documentation. Describe the equipment in the enterprise Network Operations Center.

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Exploring the Enterprise Network Infrastructure

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  1. Exploring the Enterprise Network Infrastructure Introducing Routing and Switching in the Enterprise– Chapter 2

  2. Objectives • Interpret network documentation. • Describe the equipment in the enterprise Network Operations Center. • Explain the importance of the enterprise edge in the provisioning of services. • Describe the Point-of-Presence for service delivery. • Identify security considerations and equipment at the enterprise edge. • Identify router and switch hardware characteristics and use router CLI configuration and verification commands. • Show the Enterprise Network Infrastructure Movie

  3. Network Documentation • Why is it important that we have accurate network documentation? • Whose responsibility is it to ensure that the network documentation is up to date and accurate?

  4. Get lost much? • Anyone who has trusted a GPS to explore an unfamiliar area knows the importance of accurate maps. • Imagine what it would be like to follow the GPS directions in an unfamiliar area late at night, only to be suddenly confronted by a road closure and not know what to do next.

  5. Interpret Network Documentation • Network infrastructure diagrams- usually linked to a database • Physical topology map - floorplans • Logical topology map – ip and interface labels • Control plane information: failure domains

  6. Interpret Network Documentation • Floor plans and blueprints • Redlining shows changes • As-built diagram documents changes from original plans

  7. Interpret Network Documentation • Business Continuity Plan • Business Security Plan • Network Maintenance Plan • Service Level Agreement

  8. Describe the Equipment in the Enterprise NOC • Raised floors • High performance UPS and HVAC • Fire suppression systems • Network monitoring equipment • MDF switches and routers

  9. Data Centers • What is a Data Center? • Whose responsibility is it to ensure that the network is up and available? http://www.cisco.com/web/about/ciscoitatwork/data_center/flash/rcdn_dc_tour/index.html

  10. Describe the Equipment in the Enterprise NOC • Server farm • Data storage • Storage Area Network (SAN) Reflection: Google “Virtual Tours of Network Operations Centers” and visit three…

  11. Interpret Network Documentation • Structured cabling standards • Main Distribution Facility (MDF) • Telecommunications room • Intermediate Distribution Facility (IDF)

  12. NAS v.s. SAN Activity • The latest trend in storage is the Storage Area Network SAN. What is the difference between a NAS and an SAN? What advantages does a SAN offer a network administrator over a NAS? Let’s research and find out. • Pretend that your boss, the Chief Information Officer for XYZ Corporation, has asked you to select a NAS or SAS for storage as the company prepares for expansion. Your job is to prepare a one page sales pitch for their CIO on the differences between an NAS and SAS and their recommendation for making the selection.

  13. NAS v.s. SAN Activity • 1. Begin by conducting an Internet search using the phrase "NAS versus SAN". This will result in a list of resources that detail the meaning of both of these terms as well as examples. • 2. Define the storage need for XYZ Corporation. You will need to define the need in order to select from the two storage choices. • 3. After conducting the research on NAS versus SAN for network storage and defining their storage need, prepare a five-minute sales pitch to you (the CIO) on the selection of an NAS or SAS to meet network storage needs.

  14. The Importance of the Enterprise Edge in the Provisioning of Services • Point-of-Presence (POP) • Demarc – the point that separates maint. responsibility • Links to outside services and sites

  15. The Importance of the Enterprise Edge in the Provisioning of Services • Security considerations at the enterprise edge • Denial of Service (DoS) attacks • Application of filtering policies • Firewall • Demilitarized zone • Intrusion detection and prevention

  16. The Importance of the Enterprise Edge in the Provisioning of Services • Connection services • WAN punchdown block • Channel Service Unit/Data Service Unit (CSU/DSU) • Customer Premises Equipment (CPE)

  17. Wireless Points-of-Presence • A growing sector of business, representing a growth area for ISPs and new opportunities for network administrators. In this activity you will explore the new opportunities presented by wireless POPs.

  18. Identify Router Hardware Characteristics • Router functions • Form factors • Interfaces • Management options

  19. Functions of Routers

  20. Routers allow packets to leave the local network • How does a router know that a packet is intended for the local network? • How does a router know that a packet is intended for an external network? • What portion of the IP address is used to route packets?

  21. Routers can select alternate routes • Routers can select alternate routes if a link goes down or traffic is congested. • What is the process that routers follow in developing routing tables?

  22. Routers also provide • Broadcast containment - What is a broadcast message? What issues do network administrators struggle within the use of broadcast messages? • Connection to remote locations. • Grouping of users logically by application or department. How does a router achieve these two functions? • Enhanced security (using NATs and ACLs).

  23. Router Management Show the Access the Router Movie

  24. Use Router CLI Show Commands • General use • Routing related • Interface related • Connectivity related • Review section 2.3.2.2 – key configuration commands are reviewed in detail.

  25. Use Basic Router Configuration Commands • Configuration management • Global settings • Line settings • Interface settings • Routing settings

  26. Identify Switch Hardware Characteristics • Switch functions • Form factors • Port density

  27. Use Switch CLI Show Commands • General use • Interface/port related • Connectivity related

  28. Use Switch CLI Configuration Commands • Configuration management • Global settings • Interface settings

  29. Summary • Network infrastructure diagrams document devices in a network • The enterprise NOC manages and monitors all network resources • The enterprise edge provides Internet and local access services and security against attacks • Access Layer switches provide end user connections, security services, and microsegmentation of collision domains • Distribution Layer routers control broadcasts and move packets between locations and the Internet

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