OSI Match
All gamesN10-009
Study for CompTIA Network+
Ten-question drills, short study cards and every answer explained, in CertPrep+.
The 7 OSI layers and what lives at each
Each layer of the OSI model with its name, its PDU and the protocols and devices that belong to it, following CompTIA's Network+ model.
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The layers are listed in the CompTIA Network+ N10-009 exam objectives (1.1). Item placements follow CompTIA study material. Layers 11 matches the layer numbers to their names, plus the four PDUs that belong to one layer. ARP, TLS and NICs are argued between two layers, so they are left out.
| Layer | Name and examples | PDU |
|---|---|---|
| The 7 layers | ||
| 7 | ApplicationHTTP, DNS, SMTP, FTP, DHCP, SSH | Data |
| 6 | PresentationFormats and encoding: JPEG, ASCII, compression | Data |
| 5 | SessionOpens, manages and closes sessions: dialog control, checkpointing, RPC | Data |
| 4 | TransportTCP, UDP, port numbers | Segment |
| 3 | NetworkRouters, IP addresses, ICMP, IPsec | Packet |
| 2 | Data LinkSwitches, bridges, MAC addresses, access points | Frame |
| 1 | PhysicalHubs, repeaters, cables, fiber | Bits |
| Items 48 · by layer | ||
| 7 | ApplicationHTTP, DNS, SMTP, FTP, DHCP, SSH, SNMP, LDAP, NTP, Telnet | Data |
| 6 | PresentationJPEG, ASCII, Compression, MPEG, GIF, Unicode | Data |
| 5 | SessionRPC, Dialog control, Checkpointing, NetBIOS, SOCKS | Data |
| 4 | TransportTCP, UDP, Port number, Three-way handshake | Segment |
| 3 | NetworkRouter, IP address, ICMP, IPsec, OSPF, Routing table, NAT, BGP | Packet |
| 2 | Data LinkSwitch, Bridge, MAC address, Wireless access point, VLAN, PPP, Spanning Tree (STP), MAC address table | Frame |
| 1 | PhysicalHub, Repeater, Patch panel, Cat6 cable, Fiber optic cable, Coaxial cable, Media converter | Bits |