Cards & Cabling
Pairs of copper wired in a way that is intended to reduce crosstalk or electromagnetic induction between each of the 4 copper pairs.
What is Twisted Pair?
An Ethernet frame with a payload greater than the standard MTU of 1,500 bytes
What are Jumbo Frames?
A computer network that spans a relatively small area.
What is a Local Area Network?
The term for the base item which TCP transfers over the network.
What is a Packet?
A tool used to verify network connectivity that rhymes with "ring".
What is Ping?
A utility for Linux kernel-based operating system for displaying and modifying some parameters of network interface controllers (NICs) and their device drivers.
What is Ethtool?
A route that is matched when no other routes are matched in a system routing table. The destination is usually listed as "0.0.0.0".
What is a Default route?
A geographically distributed private telecommunications network that interconnects multiple Local Area Networks.
What is a Wide Area Network?
The beginning of a TCP conversation, where features that are supported can be announced or negotiated.
What is a three way handshake?
The failure of one or more transmitted packets to arrive at their destination.
What is Packet Loss?
An effective short range cable that has it's wiring connected directly into the modules on both ends. It is commonly used in data centers due to its low cost.
What is a DAC / Twinax cable?
Often referred to as a "forwarding database" or "Content Addressable Memory" table, this item contains information used by switches to forward frames on a Local Area Network.
What is the MAC Address Table?
A protocol used by the Internet Protocol (IP) RFC 826, specifically IPv4, to map IP network addresses to the hardware addresses used by a data link protocol.
What is ARP?
The type of acknowledgement used to indicate that some, but not all of the data was received.
What is a SACK?
Often used as a system troubleshooting methodology, this framework has the mnemonics "All people seem to need data processing" and "Please do not throw sausage pizza away".
What is the OSI Model?
(Application, Presentation, Session, Transport, Networking, Data-link, Physical)
A way of bundling many individual Ethernet links together so that they act like a single logical link.
What is a Link Aggregation Group?
A custom switch configuration that may be used to segment broadcast domains.
What is a VLAN?
The device used to get to a remote subnet (one which is not available on the source).
What is a gateway?
An algorithm that seeks to control throughput to minimize packet loss in a TCP conversation.
What is TCP Congestion Control?
A mechanism for temporarily pausing the transmission of data on Ethernet networks when a sending node transmits data faster than the receiving node can accept it.
What is Ethernet Flow Control?
The preferred type of cable for 10Gigabit Twisted Pair connectivity.
What is Cat6a?
A connection that joins two switches and maintains VLAN information as traffic flows between switches and routers.
What is an ISL?
(Inter-switch Link)
The term used for a subnet in which all devices are expected to be able to communicate with each other, but a boundary is in place that prevents communication between some devices.
What is a Disjointed Subnet?
Described in RFC 2581, this "window" may auto-tune on a receiving device based on measured network conditions.
What is a Receive window?
A logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. This entity can exist within the same LAN segment, or it can be bridged to other LAN segments.
What is a Broadcast Domain?