Identify and capture network evidence across wireless, internal and external traffic, web-proxy traffic, logs, and configurations, while collaborating with admins to access data and preserve evidence for forensic analysis.

Review key definitions, acquisition, and content and storage, with emphasis on volatile information and careful capture. Address privacy and seizure concerns and stress collaboration with HR and the legal department.

Explore network forensics through investigative methodology and module three, applying focused techniques to analyze network events and evidence.

Plan what information to capture and prepare the tools for evidence collection. Document every step with timestamps, consider legal issues, and build a timeline and hypothesis to guide court-ready inquiry.

Capture digital evidence without altering it, focusing on volatile memory and hard drives, and create bit-level copies for investigation so the original remains intact for court.

Analyze evidence by applying metadata properties, arranging data in chronological order to build a timeline, test the hypothesis, and reveal where, when, and why events occurred.

Craft a stand-alone report that documents how we found information, the evidence, chain of custody, and methods, so diverse audiences from judges to technical teams can understand without extra explanation.

Explore how switches differ from hubs by using MAC address tables to minimize traffic, and learn how forensics investigators analyze switch logs and flooding attacks to reveal attacker activity.

Routers connect subnets and networks with a routing table stored in volatile memory to forward packets, share routing tables, risk loops that cause denial of service, and preserve volatile evidence.

Examine authentication servers to identify active directory, single sign-on, username/password, certificates, multifactor authentication, and smart cards; then audit logs for anomalies and brute-force patterns.

Understand how perimeter firewalls inspect each crossing packet and enforce rules based on origin, destination, port, application, or subnet, and how rules target application to network layers.

Explore various application servers, from web servers and SharePoint to SQL Server and Exchange, and learn how logs reveal who connected, what rights, and data transferred across server communications.

Central log servers consolidate volatile and file logs from devices, enabling forensic analysis by preserving in-memory data and allowing fast searching to trace events across machines.

Analyze packet layers in the Internet Protocol Suite to identify IP and MAC addresses, ports, and transport protocols. Understand how headers, payloads, and checksums ensure data integrity across transmission.

This lecture contrasts tcp and udp, describing tcp as reliable transport with packets, while udp is a broadcast lacking reliability, involving source and destination ip addresses and 32-128-bit variants.

Explore the principles of Internet connectivity and networking within networks, and understand how these concepts enable reliable data exchange in digital communications.

Explore the western model and TCAP, based on the OSI model, standardized in the 1980s to ensure interoperable communication across hardware and applications.

Trace the history of communication protocols from early Darpa efforts to the first standards, emphasizing interoperability across hardware and software through universal models.

Explore how the seven-layer OSI model encapsulates data from the application layer to the physical layer, passing it layer by layer until bits become tangible signals for transmission.

Describe how data starts at the application layer, selecting the right tool and application, then undergoes encapsulation through successive layers until it reaches the physical layer.

Explore how the OSI model encapsulates data layer by layer from application to physical, adding headers and footers that carry destination addresses like IP and MAC and a checksum.

Illustrate the OSI model data names from application to physical, detailing application data stream, transport segment, network packet, data link frame, and bits for forensic packet analysis.

Explore the TCAP IP suite and how IP addressing is configured from the bindery level to the machine. Compare the IP, TCAP, and UDP layers with the OS side model.

Explore the VIP suite and its components, and learn to distinguish normal from abnormal network traffic. Recognize anomalies to uncover attacks or unauthorized access.

Identify layer 4 protocols, with a focus on udp traffic, and note that tcap udp is the most commonly encountered among other protocols.

Convert decimal to binary by following the machine's first steps. Take the IP, apply the subnet mask, and perform the addition to produce the results.

Private IP addresses power internal networks; internet access requires a publicly leased IP from an ISP. The lecture highlights private internal ranges like 10, 172, 192, and 121.

Learn the basics of subnetting to control traffic by splitting an IP address space into subnets, using the network portion and subnet mask, and route traffic between subnets via routers.

Explain how the subnet mask reveals which portion of an IP address is the network and which is the host, clarifying the mask's objective.

Explain subnet masks and classful addressing, showing how changing the mask shifts host counts and applying two to the power of n minus two to calculate available hosts.

Explore the transmission control protocol as a connection-oriented, session-oriented protocol, where the packet header declares source and destination IP addresses and includes the MAC address.

Explores the physical layer of networks, detailing copper and optical fiber cables, and demonstrates methods to tap and sniff traffic directly from cables with minimal footprint.

Inline network taps duplicate packets and sniff traffic without interrupting communication, using a four-port device that copies traffic to a monitoring system.

Understand how switches build a mac address table to forward traffic, why flooding converts a switch to a hub for sniffing, and how poisoning and dns poisoning enable traffic capture.

Learn how newer switches use span port analyzer (port mirroring) to duplicate packets and send them to a dedicated port for traffic capture, enabling full network visibility without flooding.

Explore the main cable types, copper, coaxial, twisted pair, and fiber, and how to intercept traffic via taps or electromagnetic sensing, with noninvasive advantages for hubs and switches.

Delve into traffic acquisition software in module eight of the certified network forensics examiner program.

Learn how libpcap and WinPcap enable packet capture and saving traffic for analysis across layer 2 through layer 3, including header details and ports, using tcpdump, wireshark, mergecap, and grep.

Compile the libpcap source code with make, then run make install to place files into the required directories, using sudo when root access is needed.

Learn to filter packets by bit positions, such as the 13th bit with value two and the 18th for sin acknowledgment, using tools like Wireshark that translate bit-level filters automatically.

Trace the background of TCAP dump and its analysis tools, including Linux lipcap and Windows windump, and explain their emergence from the early 1990s to the late 1990s.

Install tcpdump on Linux by unzipping and extracting the tarball, changing into the directory, and running ./configure, then make and make install, following the exact same installation process.

Install Wireshark and perform protocol analysis to identify the types of information that can be found in captured traffic.

Understand how Wireshark runs identically on Windows and Linux for effective traffic capture. Compare promiscuous and non-promiscuous modes, including MAC address filtering and silent traffic behavior.

Install Wireshark on Windows by downloading the software, accepting the licensing terms, and completing the straightforward installation on Windows.

Explore Wireshark, its purpose, and the installation process, then perform initial analysis of captured data. Observe that the syntax remains identical across steps.

Explore common interfaces in network forensics to understand how different systems expose data for analysis within the CNFE framework.

Explore console connections, ssh and sftp usage, and web-based management interfaces, then assess the security weaknesses of telnet and snmp and information exposure.

Secure shell encrypts command-line traffic to protect remote administration. Forensic investigators assess SSH by examining source and destination to confirm normal usage and spot abnormal client-to-client patterns.

Telnet remains a powerful, old tool accessed via command lines to modify configurations and services, often unused by clients but flagged by investigators when port 23 traffic appears.

Develop your strategic approach by outlining key to-dos and don'ts for effective network forensics practice.

Avoid powering down active machines in digital forensics and minimize changes; only power off if attack is evident to salvage data, and perform bit-level imaging on copies to preserve evidence.

Connect remotely to gather information without physically accessing the machine or altering its logs, using import scanning as the strategy.

Explore wireless frequency ranges—2.5 GHz, 3.7 GHz, and 5 GHz—and recognize that higher frequencies reduce coverage, aiding detection of rogue access points in forensic investigations.

Learn how csma/cd uses Aloha-inspired packet trailers and voltage sensing on the wire to detect collisions and employs random delays to avoid simultaneous transmissions.

Observe that wireless nodes see only the access point and cannot transmit and receive simultaneously, so collision detection fails; they rely on collision avoidance with backoff.

Investigate the 802.11 protocol suite by identifying management, control, and data frames, and learn to capture packets and identify forensics-relevant portions in wireless networks.

Explore 802.11 management frames and their header role in wireless communication, including ip addresses, mac addresses, and the service set id that reveals which access point the node communicates with.

Explore 802.11 protocol suite frame types, with a focus on management frames and the information revealed by hex data for forensic investigators.

Examine the data portion of the frame—the payload or raw data sent in a packet—and understand the three main areas and the information types within the data portion.

Explore big-endian and little-endian byte order, revealing how memory storage and packet assembly influence decoding in wireless forensics. Understand why correct endianness matters for accurate data reconstruction.