Nimble Tech Test 2025/2026.
Physical Layer 1
Describes mechanical and electrical details of netowrk components (Cables, connectors, interfaces,
etc..)
Data Link Layer 2
Basic technique networks use to uniquely identify devices on the network (like MAC Addresses) and
the means for one device to send information over the physical layer to another device in the form
of Packets
Network Layer 3
Handles the routing of data across networks. Routers operate at this later.
Transport Layer 4
Provides for reliable delivery of packets
Session Layer 5
Establishes sessions between network applications
Presentation Layer 6
Converts data so that systems that use different data formats can exchange information
Application Layer 7
Allows applications to request network services
Maximum Transmission Unit (MTU)
The largest packet size supported on an interface.
Transmission Control Protocol (TCP)
Provides connection-oriented data management and reliable data transfer. Uses handshakes (like
SYN, SYN-ACK, ACK). Slower than UDP.
User Datagram Protocol (UDP)
Provides a lightweight service for connectionless data transfer without error detection and
correction. Faster than TCP and does not use handshakes
Asymmetric Logical Unit Access (ALUA)
An industry standard protocol for identifying optimized paths between a storage system and a host.
It enables the initiator to query the target about path attributes, such as primary path and secondary
path. It also allows the target to communicate events back to the initiator. It is beneficial because
multipathing software can be developed to support any storage array. Proprietary SCSI commands
are no longer required to determine primary and secondary paths.
Multipathing
Physical Layer 1
Describes mechanical and electrical details of netowrk components (Cables, connectors, interfaces,
etc..)
Data Link Layer 2
Basic technique networks use to uniquely identify devices on the network (like MAC Addresses) and
the means for one device to send information over the physical layer to another device in the form
of Packets
Network Layer 3
Handles the routing of data across networks. Routers operate at this later.
Transport Layer 4
Provides for reliable delivery of packets
Session Layer 5
Establishes sessions between network applications
Presentation Layer 6
Converts data so that systems that use different data formats can exchange information
Application Layer 7
Allows applications to request network services
Maximum Transmission Unit (MTU)
The largest packet size supported on an interface.
Transmission Control Protocol (TCP)
Provides connection-oriented data management and reliable data transfer. Uses handshakes (like
SYN, SYN-ACK, ACK). Slower than UDP.
User Datagram Protocol (UDP)
Provides a lightweight service for connectionless data transfer without error detection and
correction. Faster than TCP and does not use handshakes
Asymmetric Logical Unit Access (ALUA)
An industry standard protocol for identifying optimized paths between a storage system and a host.
It enables the initiator to query the target about path attributes, such as primary path and secondary
path. It also allows the target to communicate events back to the initiator. It is beneficial because
multipathing software can be developed to support any storage array. Proprietary SCSI commands
are no longer required to determine primary and secondary paths.
Multipathing
