The correct command to capture packets that are part of established TCP sessions is tcpdump -i eth0 'tcp[tcpflags] & (tcp-syn) == 0'. This command uses a bitwise AND operator to inspect the TCP flags and checks if the SYN flag is not set. This captures packets that are not part of the initial TCP handshake, as required. The other options incorrectly filter the traffic, either capturing all TCP packets, only SYN packets, or only packets without ACK flag set, instead of filtering out SYN packets to focus on established connections. Understanding the TCP flag filtering is crucial when performing in-depth packet analysis.

Stateless address autoconfiguration (SLAAC) enables an IPv6 network device to configure its own network interface addresses using a combination of locally available information and router advertisements. No manual configuration is needed, nor is there a requirement for another service, such as DHCP, to assign the addresses, making SLAAC pivotal for autonomic network address configuration in IPv6 networks.

127.0.0.1 is the IPv4 loopback address. Answer 00-21-86-5C-B4-6C is a mac address, while the remaining answers are IPv6 addresses, in IPv6 the loopback is ::1

The correct answer is 'iperf' because it is specifically used for measuring the maximum bandwidth of the network, which can help in determining the performance between two points on a network. The other options presented are not intended primarily for bandwidth measurement. 'Wireshark' is used for packet analysis and capturing network traffic. 'Ping' is used for checking connectivity and response times, while 'NetFlow analyzers' are used to visualize network traffic flows for monitoring purposes.

A distributed denial-of-service (DDoS) attack involves multiple systems, which are often compromised, that flood the target system with network traffic to overwhelm resources and bandwidth, thereby disrupting service. While a DoS attack also disrupts service, it typically originates from a single source, making the option about a single IP less appropriate. Traffic shaping is a management technique and not an attack type, thus it is incorrect in this context. A SYN flood is a type of DDoS but the question describes a scenario involving multiple systems, which directly indicates a DDoS attack, making the general term more accurate in this context.

The administrator should analyze flow records. These records typically consist of details like the endpoints communicating over the network, the time at which communications occurred, and the identifiers for the applications in use. This information is integral to traffic pattern analysis and threat detection, as it allows for the assessment of communication origins, destinations, and timing, which can reveal unusual or unauthorized activities. The information about the type of cable is not directly related to traffic flows and is more pertinent to network infrastructure assessments. The physical addresses, often referring to MAC addresses, are important for internal network configuration and troubleshooting but are less useful for identifying traffic patterns across larger IP networks. The configuration of VLANs is crucial for internal network segmentation but does not provide direct insights into the content or nature of the data flows.

A Layer 3 capable switch is the correct choice because it can segment network traffic into different VLANs to reduce broadcast domains, and perform inter-VLAN routing without the need for an external router. This improves overall network performance and is suitable for a SCADA network where reliability and efficiency are critical. A hub cannot segment traffic and creates one large collision domain, leading to inefficiencies and potential network collisions. A wireless LAN controller is specifically designed to manage wireless access points, and is not applicable for segmenting wired SCADA network traffic. A repeater merely extends the signal but does not segment the traffic or reduce broadcast domains.

An intrusion detection alarm system is designed to detect unauthorized entry into a specific area or to compromise equipment. This system can incorporate multiple sensors that trigger an alarm when tampering is detected, making it the most comprehensive solution for detecting and reporting unauthorized physical access. CCTV with motion detection only records and possibly notifies of movement in the visual field, but without intrusion sensors, it doesn't specifically indicate tampering with the equipment. RFID tags simplify inventory management but do not alert to tampering events. A case lock secures the hardware but does not provide active monitoring or reporting if tampering occurs.

The 2.4GHz frequency band is divided into multiple channels, each 22 MHz wide, with only channels 1, 6, and 11 being non-overlapping in many regulatory regions. Using non-overlapping channels prevents interference between wireless networks operating in close physical proximity. Therefore, the network administrator should choose either channel 1, 6, or 11, based on which is least used by the existing networks, to minimize the chances of interference.

TACACS+ is designed to provide a centralized authentication mechanism for users accessing network devices and services. It works on TCP port 49, ensuring reliable transport. Unlike RADIUS, which typically uses UDP, TACACS+ uses TCP, thus providing a connection-oriented protocol that guarantees the delivery of packets.

This statement is false because Krone and 110 punchdown blocks have different design specifications and thus often require their specific tools for proper wire termination. Using a 110 punchdown tool on a Krone block can result in poor connections and may damage the block or the tool.

The Windows ping command uses ICMP (Internet Control Message Protocol) echo request to reach a target IP, then the host will reply with an ICMP Reply.

Identifying any changes that have occurred is critical in troubleshooting network issues. Changes can include software or hardware updates, configuration adjustments, or new installations that could a potential cause for the observed network slowdown.

Using switches in a stacked configuration is the recommended solution because it allows for multiple switches to be configured and managed as a single entity, providing redundancy. If one switch within the stack fails, the rest of the switches continue to operate, thus maintaining network availability. The implementation of Spanning Tree Protocol, while useful for preventing loops, does not itself provide redundancy for switch failure. The addition of a protocol analyzer improves monitoring capabilities but does not offer resilience against hardware failure. Installing a higher-rated power supply enhances power delivery and reliability but does not address switch redundancy.

A Load Balancer is a network device that distributes workloads between different resources like servers, routers and switches. For example, a large website may use a Load Balancer and multiple identical web servers to prevent from overloading a single device.