Network Layer
TCP, the Transmission Control Protocol, is a layer-4 protocol (in the 7-layer OSI model).
FTP (File Transfer Protocol) is an application layer, or Layer 7, protocol.
Hubs and repeaters operate at the Physical Layer of the OSI Model. The Physical Layer is the first layer of the OSI Model.
Layer 3
According to Cisco Curriculum Semester 4 1.2.1.1 As described in relation to the OSI reference model, WAN operations focus primarily on Layer 1 and Layer 2. WAN access standards typically describe both Physical layer delivery methods and Data Link layer requirements, including physical addressing, flow control, and encapsulation.
Network
smtp(simple mail transfer protocol,),ftp,(file trasfer protocol),ip(nternet protocol).
DNS is an application layer protocol. The application layer of the OSI model is the layer closest to the user and provides network services to the applications of the user. Examples of protocols that operate at the application layer are: DNS, FTP, TFTP, SNMP, TELNET, RLOGIN, SMTP, MIME, NFS, FINGER, BOOTP and SMB.
The mail protocol, right? Yes, that is considered part of the application layer.
TCP, the Transmission Control Protocol, is a layer-4 protocol (in the 7-layer OSI model).
FTP (File Transfer Protocol) is an application layer, or Layer 7, protocol.
Hubs are a physical layer (layer 1) device; most switches operate at the Data Link layer (Layer 2) of the OSI model.
IP is a layer 3 (network layer) protocol used for routing
Ethernet is a data link layer protocol - layer 2
HTTPS is not a separate protocol, but refers to use of ordinary HTTP over an encrypted Secure Sockets Layer (SSL) or Transport Layer Security (TLS) connection. So it really does not have a place per say, because it's not a protocol it's a hybrid. Or you can say it originates in the Application layer and then finishes in the Presentation layer.
ARP is protocol that doesn't fit nicely into the OSI model. It's not a layer two protocol because it utilizes Ethernet_II (Data Link) to get around with broadcast addresses (FF:FF:FF:FF:FF:FF). It's also not a layer three protocol because it doesn't provide routing capabilities. It maps layer 2 addresses to corresponding layer 3 addresses. So you could say it's 2.5. It is encapsulated within Ethernet_II frames.
Hubs and repeaters operate at the Physical Layer of the OSI Model. The Physical Layer is the first layer of the OSI Model.