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CPE 426 Computer Networks: Term 1-56 Homework 1 Wk 3 Solutions ภาคเรียนที่ 1/2556 วิชา CPE426 Computer Networks: HW Wk3; Review 3+TCP/IP Concept 1 ชื่อ______________________________________รหัส_____________________Section________ CPE 426 Computer Networks: Term 1-56 Homework 1 Wk 3 Solutions Review III: LAN Technologies and Chapter 20: TCP/IP Concept ใหนกศั ึกษาแสดงคําตอบโดยเขียนลงในชองว างที่ใหไว สงตนชั่วโมงสัปดาหถัดไป 1. ใหนักศึกษาเขา Web Site ของ IEEE หรือ Search จาก IEEE802 Standard จากนั้นใหหาวามาตรฐาน IEEE802 ตอไปนี้เปน มาตรฐานของอะไร ตอไปนี้เปนขอมูลจาก http://en.wikipedia.org/wiki/IEEE_802 IEEE 802 Working Groups Name Description Note IEEE 802.1 Bridging (networking) and Network Management IEEE 802.2 LLC inactive IEEE 802.3 Ethernet IEEE 802.4 Token bus disbanded IEEE 802.5 Defines the MAC layer for a Token Ring inactive IEEE 802.6 MANs (DQDB) disbanded IEEE 802.7 Broadband LAN using Coaxial Cable disbanded IEEE 802.8 Fiber Optic TAG disbanded IEEE 802.9 Integrated Services LAN (ISLAN or isoEthernet) disbanded IEEE 802.10 Interoperable LAN Security disbanded IEEE 802.11 a/b/g/n Wireless LAN (WLAN) & Mesh (Wi-Fi certification) IEEE 802.12 100BaseVG disbanded IEEE 802.13 Unused[2] IEEE 802.14 Cable modems disbanded IEEE 802.15 Wireless PAN IEEE 802.15.1 Bluetooth certification IEEE 802.15.2 IEEE 802.15 and IEEE 802.11 coexistence IEEE 802.15.3 High-Rate wireless PAN Low-Rate wireless PAN (e.g., ZigBee, WirelessHART, IEEE 802.15.4 MiWi, etc.) IEEE 802.15.5 Mesh networking for WPAN IEEE 802.15.6 Body area network ภาควิชาวิศวกรรมคอมพิวเตอร วิทยาลัยวิศวกรรมศาสตร มหาวิทยาลัยรังสิต ภาคเรียนที่ 1/2556 วิชา CPE426 Computer Networks: HW Wk3; Review 3+TCP/IP Concept 2 ชื่อ______________________________________รหัส_____________________Section________ IEEE 802.16 Broadband Wireless Access (WiMAX certification) IEEE 802.16.1 Local Multipoint Distribution Service IEEE 802.17 Resilient packet ring IEEE 802.18 Radio Regulatory TAG IEEE 802.19 Coexistence TAG IEEE 802.20 Mobile Broadband Wireless Access IEEE 802.21 Media Independent Handoff IEEE 802.22 Wireless Regional Area Network IEEE 802.23 Emergency Services Working Group IEEE 802.24 Smart Grid TAG New (November, 2012) IEEE 802.25 Omni-Range Area Network Not yet ratified IEEE802.1 Bridging (networking) and Network Management IEEE802.2 LLC IEEE802.3 Ethernet IEEE802.4 Token bus IEEE802.5 Defines the MAC layer for a Token Ring IEEE802.11b 11 Mb/s, 2400 MHz WLAN IEEE802.11g 56 Mb/s, 2400 MHz WLAN IEEE802.11n MIMO Antenna WLAN IEEE802.15.1 Bluetooth certification IEEE802.15.4 Low-Rate wireless PAN (e.g., ZigBee, WirelessHART, MiWi, etc.) IEEE802.16 Broadband Wireless Access (WiMAX certification) 2. ใหนักศึกษา Search มาตรฐาน RFC ที่เปนมาตรฐานของ Internet และดูแลโดยองคกร IETF หาวา RFC ตอไปนี้เปนมาตรฐาน เกี่ยวกับอะไร RFC 791 Internet Protocol, IPv4 RFC 792 INTERNET CONTROL MESSAGE PROTOCOL, ICMP RFC 826 An Ethernet Address Resolution Protocol, ARP RFC 1918 Address Allocation for Private Internets RFC 1945 Hypertext Transfer Protocol -- HTTP/1.0 RFC 2131 Dynamic Host Configuration Protocol, DHCP RFC 2616 Hypertext Transfer Protocol -- HTTP/1.1 RFC 2821 Simple Mail Transfer Protocol, SMTP RFC 3022 Traditional IP Network Address Translator (Traditional NAT) RFC 4291 IP Version 6 Addressing Architecture ภาควิชาวิศวกรรมคอมพิวเตอร วิทยาลัยวิศวกรรมศาสตร มหาวิทยาลัยรังสิต ภาคเรียนที่ 1/2556 วิชา CPE426 Computer Networks: HW Wk3; Review 3+TCP/IP Concept 3 ชื่อ______________________________________รหัส_____________________Section________ RFC 4787 Network Address Translation (NAT) Behavioral Requirements for Unicast UDP 3. อธิบาย Collision Domain หมายถึงขอบเขตของเครือขายที่เมื่อ Host ที่อยูในขอบเขตเดียวกันสงขอมูลออกมาสามารถที่จะชนกันได ถาคอมพิวเตอรสองเครื่องใน Collision Domain เดียวกัน สงขอม฿ลออกมาพรอมกัน จะเกิดการชนกัน 4. อธิบาย Broadcast Domain หมายถึงขอบเขตของ Network ที่สามารถรับสงขอมูลแบบ Broadcast ถึงกันได ใน LAN คือ LAN หนึ่งวงที่เชื่อมกัน ภายในดวย Hub หรือ Switch ในการทํา VLAN จะหมายถึงหนึ่ง VLAN ใน Internet จะหมายถึงหนึ่ง Subnet หรือหนึ่ง Network ที่ใช Prefix รวมกัน 5. Switch 10/100/1000 ขนาด 24 Port โดยที่แตละ Port มีความสามารถแบบ Full-Duplex และเปน Wirespeed (รับสงขอมูลได เต็มขนาดของ Bandwidth ที่กําหนด ตลอดเวลา) ใหนักศึกษาลองคํานวณดูวาการที่จะให Switch มีความสามารถดังกลาว คา Bandwidth ของ Bus ภายในตัว Switch จะตองมีความสามารถอยางนอยเทาไร แตละ Port ตองมีความสามารถรับขสงขอมูลได 2000 bps x 24 Port = 48 Gbps(Full Duplex) 6. อธิบายการเกิด Broadcast Storm ใน Switched Ethernet (อธิบายไปแลวในการบานกอน ) เมื่อมีการสง Broadcast Traffic ออกมา ตัว Hub หรือ Switch จะ Copy Frame นี้ออกไปทุก Port ถา มี Loop ใน Network ขอมูลจะวิ่งเปนวงและถูก Copy เปนจํานวนทวีคูณทุกครั้งที่ผาน Switch หรือ Hub ทําให Network Down เพราะมี แต Copy ของ Broadcast Frame วิ่งอยูใน Network จนเต็ม Bandwidth 7. จากรูป Network ขางลาง จงหาวา Link a และ Link b ควรจะตองทํา VLAN Tag ของ VLAN อะไรบาง SW 1 VLAN 700 (6 PC) VLAN 100 (9 PC) Link ‘a’ Link ‘b’ SW 2 SW 3 VLAN 200 (8 PC) VLAN 600 (8 PC) VLAN 400 (8 PC) SW 4 SW 5 VLAN 300 (4 PC) SW 6 VLAN 400 (5 PC) VLAN 200 (5 PC) VLAN 200 (4 PC) VLAN 500 (6 PC) VLAN 300 (5 PC) VLAN 500 (5 PC) VLAN 100 (6 PC) Link ‘a’ จะตองนํา VLAN 200, 300, 400, 500 Link ‘b’ จะตองนํา VLAN 100, 200, 300, 400, 500 ภาควิชาวิศวกรรมคอมพิวเตอร วิทยาลัยวิศวกรรมศาสตร มหาวิทยาลัยรังสิต ภาคเรียนที่ 1/2556 วิชา CPE426 Computer Networks: HW Wk3; Review 3+TCP/IP Concept 4 ชื่อ______________________________________รหัส_____________________Section________ 8. จากรูปในคําถามขอ 7 ใหนักศึกษาเขียน Logical Diagram แสดงแตละ VLAN แยกออกจากกันในแตละ Switch จากนั้นให เขียน Logical Diagram แสดงเฉพาะแตละ Network ของ LAN ลงในชองคําตอบขางลาง SW 1 VLAN 700 (6 PC) VLAN 100 (9 PC) SW 2 SW 3 VLAN 200 (8 PC) VLAN 600 (8 PC) VLAN 300 (4 PC) VLAN 400 (8 PC) SW 4 SW 5 SW 6 VLAN 200 (5 PC) VLAN 200 (4 PC) VLAN 500 (6 PC) VLAN 300 (5 PC) VLAN 500 (5 PC) VLAN 100 (6 PC) Logical Diagram ของ Network แสดงแตละ VLAN ใน Switch VLAN 100 (15 PC) VLAN 200 (17 PC) VLAN 300 (9 PC) VLAN 400 (13 PC) VLAN 500 (11 PC) VLAN 600 (8 PC) VLAN 700 (6 PC) Logical Diagram ของ Network แสดงแตละ VLAN รวม Switch 9. อธิบาย Concept ของ Internet วามี Key Component และ Protocol อะไร จึงสามารถทําใหการเชื่อมตอระหวาง Network หลายๆประเภทสามารถกระทําได 1. Router เปนอุปกรณเชื่อมตอระหวาง Network ที่แตกตางกัน จะเปนตัวแปลง Physical Layer และ Datalink Layer ของแต ละ Network ที่มาเชื่อมตอ 2. Internet Protocol เปนตัวกําหนด Global Address ทําหรับทุกๆ Host ที่มาเชื่อมตอกัน ไมวา Host นั้นจะอยูใน Network ใด 10. จากรูปขางลางแสดง Network 6 Network ที่ตองการเชื่อมตอกันโดยใช IP Technology ใหนักศึกษาออกแบบ Topology ใน การเชื่อมตอดังกลาว โดยวาด Router และ Link ในการเชื่อมตอลงในรูปขางลาง กําหนดให 1. ถาตองการ Network รวมที่มีราคาถูกสุด ใหเขียน Topology ขางลาง ภาควิชาวิศวกรรมคอมพิวเตอร วิทยาลัยวิศวกรรมศาสตร มหาวิทยาลัยรังสิต ภาคเรียนที่ 1/2556 วิชา CPE426 Computer Networks: HW Wk3; Review 3+TCP/IP Concept 5 ชื่อ______________________________________รหัส_____________________Section________ NW 1 NW 6 NW 2 Router NW 5 NW 3 NW 4 Topology ของ Network ขอ 10 ขอยอย 1 2. ถาตองการ Network รวมที่มีความคงทนและ Redundancy สูงสุด NW 1 NW 6 NW 2 NW 5 NW 3 NW 4 Topology ของ Network ขอ 10 ขอยอย 2 (Full Mesh) 3. ถาตองการเชื่อมตอ Network โดยใช Router ที่มีเพียงสอง Interface เทานั้น NW 1 NW 6 NW 2 NW 5 NW 3 NW 4 Topology ของ Network ขอ 10 ขอยอย 3 (Loop) จบการบานสปดาหั ที่ 3 ภาควิชาวิศวกรรมคอมพิวเตอร วิทยาลัยวิศวกรรมศาสตร มหาวิทยาลัยรังสิต .
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