OSI Model
OSI layer that uses MAC addresses to identify other systems on the network.
What is Data Link (Layer 2)?
The combination of an IPv4 address and a port number.
(e.g. 192.168.5.4:443)
What is a Socket?
The network address for a host with IPv4 address 192.168.10.15 and subnet mask 255.255.255.0.
What is 192.168.10.0?
Network device that divides networks into multiple collision domains while maintaining a single broadcast domain.
What is a switch?
The table a router uses to make routing decisions.
What is Routing Table?
OSI layer responsible for transmitting signals over the network medium.
What is Physical (Layer 1)?
The range of well known TCP/UDP ports.
What is 0-1023?
The default network mask for an IPv4 Class A network.
What is 255.0.0.0 (/8)?
Provides logical segmentation of a physical switch to isolate traffic at Layer 2, increasing security and shrinking broadcast domains.
What is Virtual Local Area Network (VLAN)?
The IPv4 address class for: 190.126.14.25
What is Class B?
OSI layer that uses logical addresses to route packets between networks.
What is Network (Layer 3)?
Prevents IPv4 packets from being transmitted endlessly from router to router.
What is time-to-live (TTL)?
The decimal notation of the subnet mask for a /16 subnet.
(e.g. 192.168.0.0/16)
What is 255.255.0.0?
Protocal that prevents network switching loops from occurring by shutting down redundant links until they are needed.
What is Spanning-Tree Protocol (STP)?
The default TCP port for HTTPS.
What is 443?
OSI layer that provides a direct interface for software to interact with services on another system.
What is Application (Layer 7)?
The IP address configured on a computer to provide access to hosts that are not on the same network.
What is Default Gateway?
The number of bits allocated to the host identifier in a /19 IPv4 subnet.
(e.g. 10.5.0.0/19)
What is 13?
Protocol used to supply electricity to devices over twisted pair network cables.
What is Power over Ethernet (PoE)?
Wireless technology that allows multiple frames to be transmitted to multiple clients simultaneously.
What is MU-MIMO?
OSI layer that divides data into segments and provides either connection-oriented or connectionless services to applications.
What is Transport (Layer 4)?
Configuring two network protocols on the same computer.
(e.g. IPv4 and IPv6)
What is Dual Stack?
The decimal value of the binary mask 11111111.11111111.11111100.00000000
What is 255.255.252.0?
Protocol that inserts VLAN tags into frames so they can be delivered to the correct VLAN on another switch over a trunk port.
What is 802.1q?
The security service provided by 802.1x (EAP).
What is authentication?