Subinterfaces are logical divisions of a physical interface that can be assigned different VLANs, IP addresses, and security policies12.
Subinterfaces allow the organization to configure multiple devices with network isolation on a single switch port by creating separate VLANs for voice and data traffic12.
Subinterfaces can also be used to implement inter-VLAN routing, which enables communication between different VLANs on the same switch or router12.
Link aggregation is the process of combining multiple physical links into a single logical link for increased bandwidth, redundancy, and load balancing3 . It does not provide network isolation or VLAN segmentation.
Load balancing is the distribution of network traffic across multiple servers or paths to optimize performance, availability, and reliability . It does not provide network isolation or VLAN segmentation.
Tunneling is the encapsulation of one protocol within another protocol, usually to provide secure or private communication over a public network . It does not provide network isolation or VLAN segmentation on a single switch port. Reference:
[CompTIA Network+ N10-008 Certification Study Guide], Chapter 3: Network Components, Section: Subinterfaces
[Professor Messer's CompTIA N10-008 Network+ Course Notes], Page 23: Subinterfaces
[CompTIA Network+ N10-008 Certification Study Guide], Chapter 3: Network Components, Section: Link Aggregation
[Professor Messer's CompTIA N10-008 Network+ Course Notes], Page 24: Link Aggregation
[CompTIA Network+ N10-008 Certification Study Guide], Chapter 3: Network Components, Section: Load Balancing
[Professor Messer's CompTIA N10-008 Network+ Course Notes], Page 25: Load Balancing
[CompTIA Network+ N10-008 Certification Study Guide], Chapter 4: TCP/IP, Section: Tunneling
[Professor Messer's CompTIA N10-008 Network+ Course Notes], Page 32: Tunneling