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Outlines Received due 8 October (local) 15 October (remote)

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Outlines Received due 8 October (local) 15 October (remote)

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  1. ECEN5553 Telecom SystemsDr. George ScheetsWeek 6Readings:[11a] "Cybercrime: Dissecting the State of Underground Enterprise"[11b] "A Call to Cyber Arms"[12a] "The Compleat Story of Phish"[12b] "Diplomatic and government agencies targeted in years-long cyberespionage operation"[12c] "DDoS Attack Doesn't Spell Internet Doom"Exam #1 Lecture 16, 24 September (Live) No later than 1 October (Remote DL)Outline 8 October 2014, Lecture 22 (Live) No later than 15 October (Remote DL)

  2. OutlinesReceiveddue 8 October (local)15 October (remote) 35 %

  3. The Internet Is... a Security Nightmare • Bad things have been out there for years • Viruses, Worms, Trojans, Denial of Service, etc. • November 2, 1988 Internet Worm • Network shut down for 2-3 days • Took advantage of • Unix buffer overflow problems • Poor password choices • 2009-2010 Stuxnet Worm • State sponsored? • Seemed to target Iran's nuclear bomb program

  4. The Internet Is... a Security Nightmare • TCOM5223Information Assurance Management • TCOM5233Applied Information Systems Security • TCOM5243Information Technology Forensics • “Remember, when you connect with another computer, you're connecting to every computer that computer has connected to.” • Dennis Miller, Saturday Night Live

  5. Pros of Using the Internet • Any-to-Any Connectivity • It’s Inexpensive (save $$$$) • Tons of valuable information available • Excellent marketing/sales tool

  6. Cons of Using the Commodity Internet • Any-to-Any Connectivity puts all attached machines at risk • Slightly higher risk of Theft of Traffic • Tons of Worthless Information Available • No QoS guarantees or Guaranteed BandwidthMay have trouble rapidly moving large filesMay have trouble reliably moving time sensitive traffic WARNING: SECURITY HAZARD!

  7. 802.3 Ethernet Packet Format Bytes: 7 1 6 6 2 MAC Destination Address MAC Source Address 40 20 6-1440 4 Data + Padding IPv6 TCP CRC

  8. Connectionless vs. Connection Oriented • Connectionless* Packet delivery may be out of order * Packet delivery NOT guaranteed* Packets may be mangled* End User’s responsibility to fix any problems • Connection Oriented* Packet delivery in order* Packet delivery usually guaranteed

  9. IP is Connectionless 20 20 up to 1,460 IP TCP Data + Padding I/O decisions based on IP address & look-up table. Tables updated independent of traffic.

  10. Wide Area Connectivity Options • Leased Line (a.k.a. Private Line) Network • Switches are byte aware • Circuit is assigned trunk BW via TDM • BW required is based on peak input rates • Route through system determined in advance. • Pricing function of distance & peak rate • Most expensive connectivity option • Highest quality connectivity option

  11. Leased Line Usage Revenues still around$34 Billion in 2009 Drop in Corporate Increase in wireless backhaul Figure Source: Insight ResearchOctober 2004Network World Article

  12. Switched Ethernet LAN's Edge Router PC Leased Lines Switched Hub PC 100, 1,000 Mbps PC 10/100 Mbps PC Switched Hub PC Switched Hub PC PC

  13. Ex) Corporate Leased Line Connectivity Detroit Leased Line Carrier Leased Line Network OKC NYC Telecom Carriers dedicate 320, 128, and 256 Kbps links for our sole use via Circuit Switching. Router

  14. Ex) Corporate Leased Line Connectivity Detroit 384 Kbps Carrier Leased Line Network OKC NYC 320 Kbps Router

  15. How will company connect to Internet? Configuration Every site connect locally? All sites connect thru, say, OKC? Type of connection Leased Line DSL? Cable Modem? Other?

  16. Detroit ISP 384 Kbps Carrier Leased Line Network OKC 320 Kbps NYC Router Ex) Internet thru OKC 640 Kbps How big should the pipe to the ISP be? 300 Kbps is outbound from ISP > 640 Kbps circuit needed.

  17. Ex) Internet thru OKC Detroit ISP 576 Kbps 640 Kbps Carrier Leased Line Network OKC 448 Kbps NYC Router Need to bump size of other 2 pipes. 194/186 I/O @ NYC → 448 Kbps 278/166 I/O @ DET → 576 Kbps

  18. WAN Design (Link Reduction) • Start with Traffic Matrix • Examine Full Mesh • Consider eliminating lightly used links • Reroute affected traffic • Compare costs at each iteration

  19. WAN Connectivity Options • Internet • Routers are packet aware • Datagrams are assigned trunk BW via StatMux • BW required based more so on average input rates • Each packet individually routed • MPLS enabled networks can use Virtual Circuits • Pricing a function of connection size • & Possibly QoS if MPLS and/or DiffServe used

  20. Ex) Commodity InternetCorporate Connectivity Detroit ISP Network OKC NYC Router Local Carriers dedicate bandwidth to our use. ISP provides random Packet Switched StatMux connectivity via datagrams.

  21. Ex) Commodity InternetCorporate & Internet Connectivity Detroit 576 Kbps ISP Network OKC 640 Kbps 448 Kbps NYC Router 310/280 I/O @ OKC → 640 Kbps 194/186 I/O @ NYC → 448 Kbps 278/166 I/O @ DET → 576 Kbps

  22. Ex) IP with QoS Corporate & Commodity Internet Connectivity Detroit 576 Kbps MPLS VC, OKC - Detroit Internet Service Provider Network OKC 768 Kbps 448 Kbps MPLS VC, NYC - OKC NYC Detroit & NYC: No change. OKC: Port Speed must be bumped to relay Detroit ↔ NYC corporate traffic.

  23. Leased Line at OKC ↔ ISP Outbound OKC→Det 144 OKC→NYC 76 OKC→ISP 60 Det →NYC 28 NYC → Det 34 • Inbound • Det→OKC 88 • Det→NYC 28 • NYC→OKC 112 • NYC→Det 34 • ISP → OKC 110 Total Outbound = 342 Kbps Total Inbound = 372 Kbps Leased Line Size > 744 Kbps Leased Line = 768 Kbps minimum.

  24. Carrier Leased Line Network Trunks Byte Aware Leased Line Cross-Connect Carrier reserves BW from pool for our use. Ex) For a 384 Kbps connection, Cross-Connects assign 6 byte sized TDM time slots 8000 times/second = 6*8*8000 = 384 Kbps.

  25. Internet Service Provider Backbone Trunks Packet Aware Leased Line Router ISP Routers assign BW for our use on Random, as needed basis via StatMux & Packet Switching.

  26. LAN LAN Internet Service Provider Network PC Trunks Leased Line Router Corporate customers might attach via Edge Router & Leased Lines. WS

  27. Internet (Inside the Cloud) • Example Internet Router 100 Mbps Trunk ?? 1.54 Mbps Connections P(Access Line is Active) = 10% How many access lines can this switch support?

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