Apple Airport Express
With more LAN ports you are able to connect more computers to the network directly using LAN cables.
Asus GX1008B V4
With more USB ports, you are able to connect more devices.
A WAN (Wider Area Network) port is most commonly used to connect the router to the Internet. It can also be used to connect to an external private network.
A higher maximum Wi-Fi speed results in better performance. This is measured in megabytes per second.
Asus GX1008B V5
Dual-band devices can transmit data quickly on the newest 5GHz band, using recent standards (eg. 802.11n, 802.11ac). They can also use the older 2.4GHz band if needed.
With DNS relay or DNS caching, the router stores the response to queries for a short time. This means that the same query will return a quicker response if repeated from another computer in the same network.
More antennas result in increased signal strength. External antennas can be repositioned in order to improve the signal, and replaced with a longer antenna if needed.
A network firewall protects a computer network from unauthorized access.
You can enable IPsec Passthrough, to allow IPsec (IP Security Protocol) encrypted/authenticated data to pass through your router, enabling increased security.
You can enable L2TP Passthrough. L2TP (Layer 2 Tunneling Protocol) is a VPN (Virtual Private Network) protocol for carrying data from one device to another securely over the Internet.
This is a router feature that is designed to authenticate individual users to an external server using a username and password. It is more secure and complex than WPA.
WPA2-PSK is a method of securing your network using WPA2 (Wi-Fi Protected Access 2) as well as a Pre-Shared Key (PSK) password. This was designed for home users without an enterprise authentication server.
With NAT you can use one IP address, e.g. that of the router, for a network of devices. It can increase security and make it easier to make changes to your internal network.
All DLNA certified products are compatible with one another. When different devices are connected to the same network, data can be transferred easily between them.
IPv6 is a newer version of the Internet Protocol. IPv6 operates as a separate network to IPv4, and has the capacity for more IP addresses and more features.