CIT 384: Network Administration Introduction CIT 384: Network Administration

Who am I? http://www.nku.edu/~waldenj1 James Walden Assistant Professor of Computer Science waldenj@nku.edu Interests: Software Assurance Information Security Programming Languages Network Security CIT 384: Network Administration

Course Administration Web Site http://www.nku.edu/~waldenj1/classes/2008/spring/cit384 Notes, readings, and assignments on web site. Assignment submission Send electronic submissions to waldenj@nku.edu Contact Information Email: waldenj@nku.edu Phone: (859) 572-5571 Office Hours: MW 2:00-3:00 CIT 384: Network Administration

CIT 384: Network Administration Course Information General network admin class We will use Cisco hardware and books. But this is not a Cisco certification class. Prerequisites INF 284 Laboratory Facilities ST 361 Textbooks CCNA Official Exam Certification Library, 3rd edition, Wendell Odom, Cisco Press, 2007. CIT 384: Network Administration

CIT 384: Network Administration Grading Grades are based on Midterm Exam (30%) Final Exam (30%) Labs (20%) Quizzes (20%) A 90-100 B 80-89 C 70-79 D 60-69 F 0-60 CIT 384: Network Administration

CIT 384: Network Administration Assignment Policy Available on web page. Your responsibility to check for announcements. Types of assignments Individual system/network assignments. Group system/network assignments. Late policy 20% penalty up to one week late 0 points given after one week late Submission format Use submit command on kosh. CIT 384: Network Administration

CIT 384: Network Administration Topics TCP/IP Architecture OSI Reference Model Cisco certification overview CIT 384: Network Administration

CIT 384: Network Administration TCP/IP Layering Application Transport Network Network Access HTTP, FTP, telnet TCP, UDP IP, ICMP, IGMP PPP, 802.11, Ethernet CIT 384: Network Administration

CIT 384: Network Administration Application Layer Applications have their own protocols. ex: FTP, HTTP, IRC, POP, SMTP, ssh, telnet Request/response pattern Client requests data from the server. Server sends a response to client. Figure from chapter 2 of CCENT/CCNA ICND1 Official Exam Certification Guide, 2nd ed CIT 384: Network Administration

CIT 384: Network Administration Transport Layer Two main protocols: TCP and UDP TCP guarantees delivery of data across network Error detection and recovery Sequence numbers and ACKs CIT 384: Network Administration

CIT 384: Network Administration Network Layer IP transmits data across the network. Addressing Routing CIT 384: Network Administration

CIT 384: Network Administration Network Access Layer Physically connects one computer to another. Common protocols Ethernet PPP 802.11 CIT 384: Network Administration

Encapsulation/De-multiplexing Sending: data sent down protocol stack Each layer prepends a header to data Ethernet frame sent as bit stream across wire Receiving: data moves up protocol stack NIC moves bits into memory as ethernet frame Each layer removes its header from packet CIT 384: Network Administration

CIT 384: Network Administration Encapsulation Figure 1.7 from TCP/IP Illustrated, Vol 1. CIT 384: Network Administration

CIT 384: Network Administration De-multiplexing Figure 1.8 from TCP/IP Illustrated, Vol 1. CIT 384: Network Administration

CIT 384: Network Administration TCP/IP Security TCP/IP has no built-in strong security. No confidentiality features. Minimal availability features (ToS options). Insecure CRC checksums for integrity. IPsec protocol extension adds security. CIT 384: Network Administration

Comparing OSI and TCP/IP Application Presentation Session Transport Network Data Link Physical Application Transport Network Network Access CIT 384: Network Administration

CIT 384: Network Administration OSI Model Breaks concepts into smaller parts. Standard interfaces between layers. Easier to develop and modify network stack. Multivendor interoperability. Modular engineering. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

CIT 384: Network Administration Application Layer Interface between user application and network stack. User authentication. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

CIT 384: Network Administration Presentation Layer Define and negotatiate data formats. ASCII, UTF-8, etc. Byte order. JPG, PNG, GIF, TIFF,... Encryption. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

CIT 384: Network Administration Session Layer Starts, stops, and manages sessions. Web browser sessions. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

CIT 384: Network Administration Transport Layer Protocols may be connection-oriented (TCP), which provide virtual circuits, or connectionless. Data delivery. Error recovery. Flow control. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

CIT 384: Network Administration Network Layer End to end delivery of data across the network. Logical addressing. Routing. Path determination. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

CIT 384: Network Administration Data Link Layer Transmits data between two adjacent computers. Logical link control Flow control Error correction Media access control Who can transmit when. Breaks data into frames. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

CIT 384: Network Administration Physical Layer Connectors and cables. Data encoding. Electrical characteristics. Application Presentation Session Transport Network Data Link Physical CIT 384: Network Administration

Cisco Certification Overview Associate: single written exam. Professional: multiple written exams. Expert: multiple written + 1 day lab exam. CIT 384: Network Administration

Entry-level Cisco Certifications ICND1+ICND2: easier, cover ½ material each. CCNA: cheaper, as you only pay for 1 exam. CIT 384: Network Administration

CIT 384: Network Administration Renewals CCNA is valid for three years. To renew your CCNA, you must either Take the CCNA exam again. Take or pass a higher level certification exam. Details @ http://www.cisco.com/web/learning/ CIT 384: Network Administration

CIT 384: Network Administration CCNP Topics: QoS, broadband, VPN, security. Requirements CCNA 3 or 4 tests Tests BSCI: Building Scalable Cisco Internetworks BCMSN: Building Cisco Multilayer Switched Networks ISCW: Implementing Secure Converged WANs ONT: Optimizing Converged Cisco Networks CIT 384: Network Administration

Specialist Certifications CCDP: Network Design Requires CCDA + CCNA. CCIP: Internetworking WAN technologies, including BGP, MPLS CCSP: Security Network security, including IDS, ASA/PIX, VPN. CCVP: Voice Voice technologies, including VoIP, IP telephony. CIT 384: Network Administration

CIT 384: Network Administration CCIE Cisco Certified Internetwork Expert Requirements Written exam. 8-hour lab at Cisco testing facility. Tracks Routing and Switching Security Service Provider (WAN) Storage Networking Voice CIT 384: Network Administration

CIT 384: Network Administration References James Boney, Cisco IOS in a Nutshell, 2nd edition, O’Reilly, 2005. Cisco, Cisco Connection Documentation, http://www.cisco.com/univercd/home/home.htm Cisco, Internetworking Basics, http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/introint.htm Wendell Odom, CCNA Official Exam Certification Library, 3rd edition, Cisco Press, 2007. Priscilla Oppenheimer and Joseph Bardwell, Troubleshooting Campus Networks, Addison-Wesley, 2002. W. Richard Stevens, TCP/IP Illustrated, Addison-Wesley, 1994. CIT 384: Network Administration