Remember ICMP
Full name: Internet Control Message Protocol
Memory aid: Internet Control Messages report network conditions.
Blocking all ICMP can break useful diagnostics and path behavior.
Study area: Protocols & logical ports · Batch 2
Relevant study for: CompTIA A+ Core 1 220-1201 · CompTIA Network+ N10-009 · CompTIA Security+ SY0-701 · Cisco CCNA 200-301 · ISC2 CISSP 2024 outline
Practice with exam flashcards →Networking & Connectivity / Knowledge library
ICMP — Internet Control Message Protocol
Carries IP control and error messages.
Why learn ICMP — Internet Control Message Protocol?
Carries IP control and error messages.
Where it came from
Blocking all ICMP can break useful diagnostics and path behavior.
- Memory aid (a learning cue, not the expansion): Internet Control Messages report network conditions.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand ICMP: Internet Control Message Protocol.
- Recall this memory aid: Internet Control Messages report network conditions.
- Explain the practical use: Carries IP control and error messages.
- Explain this distinction: Blocking all ICMP can break useful diagnostics and path behavior.
- Identify ICMP in a device specification, architecture diagram, or system inventory.
Documentation and sources
- IETF RFC 792 (www.rfc-editor.org)