Network+ (N10-009) · ELI Explains Port Numbers (book)
Ports 10000–65535
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The college version
Port 11211 — Memcached
At a Glance
- Transport: TCP/UDP
- Common service: Memcached
- Main purpose: Distributed memory caching
- Status: Official, current
- Related ports: None
What It Does
Caches data in RAM for microsecond retrieval. Websites check here before the database.
ELI Explains "FAQ" poster on classroom wall. Students check first. Answer there? Instant. Teacher doesn't repeat.
A 10-Year-Old's Example Teacher writes five common answers on whiteboard. You raise hand — teacher points. Memcached is that board.
Remember This Memcached: RAM caching. Restrict to trusted servers.
Security Note Memcached access controls depend on deployment and build options. Disable UDP unless needed, bind to trusted interfaces, and never expose it broadly.
Port 27017 — MongoDB
At a Glance
- Transport: TCP
- Common service: MongoDB Database
- Main purpose: NoSQL document database
- Status: Official, current
- Related ports: None
What It Does
Default MongoDB port. JSON-like documents instead of table rows. Flexible structures.
ELI Explains Information in folders, not spreadsheets. Each document can differ — one with photo, another just text.
A 10-Year-Old's Example Desk folders: Science has photos + report + drawing. English has just report. MongoDB: each folder unique.
Remember This Default MongoDB port. Flexible documents. Always enable authentication.
Security Note Publicly exposed MongoDB causes frequent data breaches — always enable authentication.
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