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As long as the PC's and NAS box are on the same VLAN, the network traffic will not need to travel up to the router.
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As long as the PC's and NAS box are on the same VLAN, the network traffic will not need to travel up to the router.

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Schoolboy question I'm sure, but I'm just after confirmation.<br />
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Ten PCs and a NAS drive each with gigabit ethernet cards are connected to a 16-port gigabit ethernet switch with Cat 6 cables.<br />
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The gigabit ethernet switch is connected to an ADSL router which supports only 100 mbps. &nbsp;The internet connection is only a 20 mbps ADSL connection anyway.<br />
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The router is connected only to the mains; the ADSL phone line; and the switch. &nbsp;No PCs connect directly to it. &nbsp;None of the equipment is using wifi.<br />
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In order for the PCs to connect to each other and the NAS drive using gigabit, does the router have to have a gigabit ethernet port (for the connection between it and the gigabit switch) or not?
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Schoolboy question I'm sure, but I'm just after confirmation.

Ten PCs and a NAS drive each with gigabit ethernet cards are connected to a 16-port gigabit ethernet switch with Cat 6 cables.

The gigabit ethernet switch is connected to an ADSL router which supports only 100 mbps.  The internet connection is only a 20 mbps ADSL connection anyway.

The router is connected only to the mains; the ADSL phone line; and the switch.  No PCs connect directly to it.  None of the equipment is using wifi.

In order for the PCs to connect to each other and the NAS drive using gigabit, does the router have to have a gigabit ethernet port (for the connection between it and the gigabit switch) or not?

Basic - gigabit ethernet switch and 100mbps router

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.

Network Architecture

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.