Term 361
Medium Dependent Interface Crossover
A Medium Dependent Interface Crossover (MDIX) is a special Ethernet cable that swaps the transmit and receive wire pairs so two similar devices can connect directly without a switch or hub.
Acronym study
Terms 361–390 of 716 CCNA acronyms and key terms. Each entry includes a plain-English definition and a link to the full 800-word glossary page with exam context and practice questions.
Term 361
A Medium Dependent Interface Crossover (MDIX) is a special Ethernet cable that swaps the transmit and receive wire pairs so two similar devices can connect directly without a switch or hub.
Term 362
A memory leak happens when a program uses up system memory but never releases it, slowly eating away at available memory until the computer slows down or crashes.
Term 363
A network topology where every device is connected to every other device, providing high fault tolerance and redundancy through multiple data paths.
Term 364
A metric is a quantifiable measurement used to assess the performance, health, or status of IT systems, networks, or applications.
Term 365
Metro Ethernet is a service that extends Ethernet networking across a metropolitan area, allowing businesses to connect multiple locations as if they were on the same local network.
Term 366
A Metropolitan Area Network (MAN) is a network that connects multiple locations across a city or large campus, providing high-speed communication like a single large network.
Term 367
A virtual database used by SNMP to organize and store managed device parameters as a structured tree of object identifiers (OIDs).
Term 368
A Missing DLL error occurs when a required Dynamic Link Library file is not found by the Windows operating system or an application, preventing the program from starting or running properly.
Term 369
MPLS (Multiprotocol Label Switching) is a data forwarding technology that uses short path labels instead of long network addresses to direct data efficiently across a network.
Term 370
MSS (Maximum Segment Size) is the largest amount of data, in bytes, that a device can receive in a single TCP segment, excluding the TCP and IP headers.
Term 371
MTU (Maximum Transmission Unit) is the largest size of a single data packet that can be sent over a network without needing to be fragmented.
Term 372
A fiber optic connector that allows multiple optical fibers to be connected and disconnected quickly by simply pushing the connector into place, with a small push-pull tab for removal.
Term 373
Multiple Input Multiple Output (MIMO) is a wireless technology that uses multiple antennas at both the sender and receiver to increase data throughput and connection reliability without needing more bandwidth or power.
Term 374
Multiprotocol Label Switching (MPLS) is a data-carrying technique that uses short path labels instead of long network addresses to route packets quickly and efficiently across a WAN.
Term 375
An MX (Mail Exchange) record is a DNS resource record that specifies which mail servers are responsible for accepting email messages on behalf of a domain.
Term 376
Network Access Control (NAC) is a security technology that enforces policies to control which devices and users can connect to a network.
Term 377
A Network Access Control List (NACL) is a stateless firewall that controls inbound and outbound traffic at the subnet level in a virtual private cloud.
Term 378
A name server is a specialized server that translates human-readable domain names into machine-readable IP addresses so that computers can find each other on a network.
Term 379
A Named ACL is a list of rules applied to a network device, identified by a name instead of a number, that controls which traffic is allowed or blocked based on source and destination IP addresses, protocols, and port numbers.
Term 380
NAT (Network Address Translation) is a method that allows multiple devices on a private network to share a single public IP address when accessing the internet.
Term 381
A NAT Gateway is a managed AWS service that allows instances in a private subnet to connect to the internet or other AWS services while preventing the internet from initiating connections back to those instances.
Term 382
A NAT instance is a virtual machine that forwards traffic from a private subnet to the internet, performing Network Address Translation (NAT) so that private instances can reach the internet without exposing them to inbound connections.
Term 383
NAT overload is a form of network address translation that allows many devices on a private network to share a single public IP address by using unique port numbers to track each connection.
Term 384
A native VLAN is the default VLAN assigned to a trunk port that carries untagged traffic for backwards compatibility with devices that do not understand VLAN tagging.
Term 385
A Native VLAN mismatch occurs when two connected switches have different Native VLANs configured on the trunk port, causing control traffic like CDP, DTP, and BPDUs to be sent on the wrong VLAN and potentially creating security vulnerabilities or connectivity issues.
Term 386
NDP (Neighbor Discovery Protocol) is a key part of IPv6 that lets devices on the same network find each other and figure out how to communicate.
Term 387
Neighbor Discovery Protocol (NDP) is a part of IPv6 that lets devices on the same network find each other, figure out each other's addresses, and keep communication working smoothly.
Term 388
Neighbor Solicitation is an IPv6 message used by a device to request another device's link-layer address (MAC address) or to verify that a target IP address is unique on the local network.
Term 389
NETCONF is a network management protocol that allows administrators to configure, retrieve, and delete settings on network devices using a structured, machine-readable data format.
Term 390
NetFlow is a network protocol developed by Cisco that collects and monitors IP traffic data to provide visibility into network usage, performance, and security.