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  2. Core Networking Concepts
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Core Networking Concepts

How networks actually work, from the wire to the TLS handshake: the OSI and TCP/IP models, IP addressing and subnetting arithmetic, DNS records and resolution, TCP and UDP behaviour, the HTTP versions, and certificates. Vendor-neutral and precise.

Engineering
AShared by Alex Chen
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Topics

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The OSI Model and the TCP/IP Stack
What each layer is responsible for, which device and which protocol lives where, and how encapsulation works on the way down the stack.
MCQ: 19
Fill-in: 17
Flashcards: 22
Pair match: 19
77 total questions
IP Addressing, CIDR and Subnetting
Prefix lengths, masks, host counts and block boundaries — with the arithmetic done exactly, plus the reserved ranges worth recognising on sight.
MCQ: 12
Fill-in: 10
Flashcards: 15
Pair match: 11
48 total questions
DNS: Record Types and Resolution Flow
What each record type actually means, how a name is resolved from root to authoritative server, and why TTLs decide how fast a change takes effect.
MCQ: 12
Fill-in: 10
Flashcards: 15
Pair match: 11
Locked · 48 questions inside
TCP vs UDP: Handshake, Flow and Congestion Control
What TCP guarantees and at what cost, how connections open and close, and how the two windows — receive and congestion — solve different problems.
MCQ: 12
Fill-in: 10
Flashcards: 15
Pair match: 11
Locked · 48 questions inside
HTTP/1.1, HTTP/2 and HTTP/3
What each version changed and why, where head-of-line blocking survives and where it does not, plus the method and status-code semantics worth knowing cold.
MCQ: 12
Fill-in: 10
Flashcards: 14
Pair match: 12
Locked · 48 questions inside
TLS, Certificates and the Handshake
What TLS proves and what it does not, how the handshake reaches a shared key, and what a client must actually verify about a certificate.
MCQ: 12
Fill-in: 10
Flashcards: 14
Pair match: 11
Locked · 47 questions inside
NAT, Firewalls, Proxies and Load Balancers
The middleboxes between a client and a server: what each one rewrites, what it decides, and what it hides.
MCQ: 12
Fill-in: 10
Flashcards: 15
Pair match: 11
Locked · 48 questions inside
Routing, Switching, ARP and VLANs
How frames get across a segment and packets get between networks: address resolution, switch behaviour, VLAN segmentation and the routing protocols above them.
MCQ: 12
Fill-in: 10
Flashcards: 15
Pair match: 11
Locked · 48 questions inside
Troubleshooting Tools: ping, traceroute, dig and tcpdump
The diagnostic toolkit, and — more importantly — how to read what each tool tells you without drawing the wrong conclusion from it.
MCQ: 12
Fill-in: 10
Flashcards: 15
Pair match: 11
Locked · 48 questions inside
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