What traffic would an implicit deny firewall rule block?
Nothing unless blocked
Inbound traffic only
Outbound traffic only
Everything that is not explicitly permitted or allowed
8.
What allows you to take all packets from a specified port, port range, or an entire VLAN and mirror the packets to a specified switch port?
Network hub
DHCP Snooping
Port Mirroring
Promiscuous Mode
9.
What kind of attack does IP Source Guard (IPSG) ?protect against?
ARP Man-in-the-middle attacks
Rogue DHCP Server attacks
DoS attacks
The correct answer and explanation is:
8. What traffic would an implicit deny firewall rule block?
Answer: Everything that is not explicitly permitted or allowed.
Explanation:
In firewall configurations, the implicit deny rule is the default behavior of most firewalls. This rule specifies that any traffic that is not explicitly permitted by a firewall rule will be automatically denied. It is not an explicit rule that the user configures, but rather the final catch-all action that the firewall takes. This ensures that any packets that do not meet the criteria set by other rules (such as specific source/destination IP addresses, ports, or protocols) will be blocked. This rule is a critical security feature, ensuring that any unintended or malicious traffic is automatically blocked, reducing potential vulnerabilities in the network. If administrators want to allow specific types of traffic, they must configure explicit permit rules.
9. What allows you to take all packets from a specified port, port range, or an entire VLAN and mirror the packets to a specified switch port?
Answer: Port Mirroring
Explanation:
Port mirroring is a technique used in network switches to copy network traffic from one port or VLAN and forward it to another port where the data can be analyzed. This is often used for network monitoring, troubleshooting, or for intrusion detection systems. With port mirroring, a network administrator can capture all the packets that come into or out of a specific port, port range, or VLAN without interrupting the normal operation of the network. This allows for deep analysis of network performance, bandwidth usage, or potential security threats. The mirrored traffic can be sent to a dedicated monitoring port, often connected to a network analyzer or a monitoring device for inspection.
10. What kind of attack does IP Source Guard (IPSG) protect against?
Answer: Rogue DHCP Server attacks
Explanation:
IP Source Guard (IPSG) is a security feature on network switches that helps protect against several types of attacks, particularly Rogue DHCP Server attacks. A Rogue DHCP Server attack occurs when an unauthorized device on the network sends out DHCP offers, causing network clients to mistakenly configure their IP settings based on the attacker’s malicious DHCP server. This can lead to denial of service (DoS) or man-in-the-middle attacks by assigning incorrect IP configurations or redirecting traffic to a malicious host.
IP Source Guard works by preventing devices from using IP addresses that are not explicitly assigned to them. It does this by filtering DHCP traffic based on bindings of IP-to-MAC addresses and can drop packets from any device trying to use an IP address that does not match its expected binding. This ensures that only legitimate devices on the network are able to use valid IP addresses, helping prevent rogue DHCP servers from successfully assigning IP configurations. This significantly strengthens the network’s defense against attacks like DHCP spoofing and other types of network manipulation.