What is a direct attack on a router (or server)?
A. Denial of Service
B. Phishing
C. trojan horse
D. Other
Correct Answer: A
Explanation/Reference:
Denial of service refers to willful attempts to disrupt legitimate users from getting access to the resources they intend to. Although no complete solution exists, administrators can do specific things to protect the network from a DoS attack and to lessen its effects and prevent a would-be attacker from using a system as a source of an attack directed at other systems. These mitigation techniques include filtering based on bogus source IP addresses trying to come into the networks and vice versa. Unicast reverse path verification is one way to assist with this, as are access lists. Unicast reverse path verification looks at the source IP address as it comes into an interface, and then looks at the routing table. If the source address seen would not be reachable out of the same interface it is coming in on, the packet is considered bad, potentially spoofed, and is dropped.
Explanation/Reference:
Denial of service refers to willful attempts to disrupt legitimate users from getting access to the resources they intend to. Although no complete solution exists, administrators can do specific things to protect the network from a DoS attack and to lessen its effects and prevent a would-be attacker from using a system as a source of an attack directed at other systems. These mitigation techniques include filtering based on bogus source IP addresses trying to come into the networks and vice versa. Unicast reverse path verification is one way to assist with this, as are access lists. Unicast reverse path verification looks at the source IP address as it comes into an interface, and then looks at the routing table. If the source address seen would not be reachable out of the same interface it is coming in on, the packet is considered bad, potentially spoofed, and is dropped.
