Introduction to Security: Week 2 – Networking
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Networking Basics
Network Protocols
The OSI Model
Numerology
A unit of data in computer networking
What is a packet
It’s how the web works: a request-response protocol
What is the HyperText Transfer Protocol (HTTP)
Cables, repeaters, hubs, binary transmission
What is the Physical layer
The first part of the TCP handshake
What is SYN
The number of layers on the OSI model
A file containing many packets
What is a PCAP file
This is the “telephone book” of the Internet, translates domain names into IP addresses
What is DNS
This layer has all the things that you know and use: email, web browsing, file transfer
What is the Application layer
You use this protocol to securely connect to a remote server (e.g., homework.cs.tufts.edu)
What is SSH
The TCP handshake process is commonly known as this
What is the Three Way Handshake
This is the world’s largest computer network
What is the Internet
No handshaking, just throwing data at you
What is UDP
The layer that provides source and destination IPv4 address
What is the Internet layer
A computer that provides data to other computers
What is a server
The common port number for HTTP
What is 80
A famous graphical and extensive packet analyzer, formerly known as Ethereal
What is Wireshark
Internet Control Message Protocol (ICMP) is commonly known for this
What is ping
This is where the Transmission Control Protocol (TCP) resides; providing source and destination ports, and data
What is the Transport layer
The layer on the OSI model that maintains connections
What is the Session layer
The common port number for SSH
What is 22
This is a series of organizational and technical documents containing specification and policies pertaining to the different aspects of the Internet.
What is Request for Comments (RFC)
Maps IP address to MAC address on a network, used for spoofing too
What is the Address Resolution Protocol (ARP)
Think MAC address, a unique identifier assigned to a network device
What is the Data Link layer
A software structure within a network node of a computer network that serves as an endpoint for sending and receiving data across the network
What is a socket
Because everyone got this wrong on Hacker Jeopardy at DEF CON: the commonly known port number for File Transfer Protocol (FTP) (https://twitter.com/defcon/status/1160056016148393984?lang=en)
What is 21
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Networking and Packets
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Original source: https://jeopardylabs.com/
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