Should a Metropolitan Area Network (MAN) be setup with a router at each site? Or, because the connections between sites are usually at layer two, should each site operate on one "master" switch which then interconnects them through a router at the main site. Or are both setups viable options?
The specific scenario I am interested is setting up a MAN for about 5 sites, each with only about 50 users and each of the sites will be interconnected through one "main" site which will also house all the servers.