From the course: Cisco CCNP SCOR Security (350-701) Cert Prep: 3 Endpoint Protection and Secure Access

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ICMP

ICMP

From the course: Cisco CCNP SCOR Security (350-701) Cert Prep: 3 Endpoint Protection and Secure Access

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ICMP

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- [Instructor] The internet control message protocol better known as ICMP, is a common tool that we use for diagnosing network communication issues. Most commonly, we use this to determine if data is reaching its intended destination or if a remote device is reachable. We also see this used for distributed denial of service attacks as well through techniques such as ping floods. Ping floods can be used to overwhelm a targeted device with a large number of ICMP echo request packets in an attempt to destabilize or crash a system. Because this is a fundamental protocol used throughout the internet, every IP network device has the capability to process ICMP messages. Although you may maybe most familiar with the 64 byte default ping packet size, ICMP packets do have a variable size data section. When we use a typical ping command to test host reachability over a network, the pinging host will send an ICMP echo request to a target host. This contains some data that will be echoed back by…

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