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A concise overview of fundamental network and security concepts, covering key technologies like wireless protocols (802.11a/b/g/n/ac), the osi model, tcp/ip layers, common ports, and various security threats and attacks. It also includes definitions of important terms like arp cache poisoning, evil twin attacks, and buffer overflows. Suitable for students learning about network and security fundamentals.
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802.11a/Wireless-A - answer wireless 5GHz - 54Mbps - 75ft 802.11b/Wireless-B - answer wireless 2.4GHz - 11Mbps - 100-150ft 802.11g/Wireless-G - answer 2.4GHz - 54Mbps - 150ft 802.11ac/Wireless-AC - answer 5GHz - 1.3Gbps 802.11n/Wireless-N - answer 2.4GHz - 200+Mbps
2.4GHz - answer Frequency ranges of 802.11G/802.11B 5GHz - answer Frequency ranges of 802.11AC/802.11A Application Layer - answer Layer 7 in the OSI model. Support for applications. Examples: HTTP, FTP, SMTP Presentation Layer - answer Layer 6 in the OSI model. Protocol conversion, data translation. Examples: ASCII, JPEG Session Layer - answer Layer 5 in the OSI model. Establishes, manages, and terminates sessions. Examples: NFS, SQL Transport Layer - answer Layer 4 in the OSI model. Ensures error-free packets. Examples: TCP, UDP Network Layer - answer Layer 3 in the OSI model. Provides routing decisions. Examples: IP, IPX
The well-known ports - answer TCP/IP Ports 1- Registered ports - answer TCP/IP Ports 1024- 49, Private ports - answer TCP/IP Ports 49,152-65, Social Engineering - answer A process by which an intruder obtains enough information from people to gain access to the network Password Cracking - answer An attack in which the attacker tries to guess the user's password Dictionary Attack - answer An attack that uses known passwords and many variations (upper- and lowercase and combinations) to try to log in to an account Brute-Force Attack - answer An attack in which the attacker uses every possible combination of characters to guess the password Packet Sniffing - answer A technique in which the contents of data packets are watched
Man-in-the-Middle Attack/MITM - answer An attack in which an attacker can seamlessly place itself in the middle of a conversation between others in order to become the recipient of all information sent by victim computers ARP Cache Poisoning ARP Cache Poisoning Attack - answer An attack in which an attacker changes the MAC addresses of the ARP cache, or "poisons the ARP cache" of victims to the MAC address of the attacker so that conversations get redirected to the attacker Evil Twin Attack - answer A situation in which a rogue wireless access point poses as a legitimate one by broadcasting a legitimate SSID and eavesdrops on the wireless network Session Hijacking - answer Exploiting web session control by stealing a session cookie and using it to establish a session with a remote server that still thinks the session is valid Buffer Overflow - answer A situation that occurs when a program tries to put more data into a buffer than it was configured to hold
HSM/Hardware Security Module - answer A hardware security module is a physical computing device that safeguards and manages digital keys for strong authentication and provides cryptoprocessing Wiretapping - answer This exploit actually breaches the physical medium or uses devices to monitor signals from outside the physical medium itself. CAT 5e - answer Supports 1000Mbps transmission speeds at 100-meter segments. Bandwidth: 100MHz CAT 5 - answer Supports 100Mbps transmission speeds at 100-meter segments. Bandwidth: 100MHz CAT 6 - answer Supports 1000Mbps transmission speeds at 100-meter segments. Bandwidth: 250+MHz CAT 6a - answer Supports 10Gbps transmission speeds at 100-meter segments. Bandwidth: 500+MHz
Proxy Server - answer This firewall feature can be used to authenticate users on behalf of another secure system
