Ping a site with a known IP address, such as yahoo, some site you know is on line. If you can ping it with the ip and not by name, you need to specify the DNS server(s).
Cisco WS-C3560-48PS-S 48-Port Managed Gigabit PoE Switch
$56.00
Cisco Nexus 48-Port 10G SFP+ Switch N9K-9396PX w/ 9K-M12PQ 12-Port 40G QSFP
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WTI NPS-4 Network Power Switch
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EtherWAN EX17242 Web-Smart 24-Port PoE Gigabit Ethernet Switch
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HP 2530-48G 48 Port Gigabit Ethernet Network Switch J9775A
$30.95
New Linksys SE3005 5-port Gigabit Ethernet Switch
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Linksys SE3008 8 Ports Rack Mountable Gigabit Ethernet Switch
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HP ProCurve 2530-24G J9776A 24 Port Gigabit Ethernet Managed Network Switch
$34.99
Juniper Networks EX3300-48P 48-Port PoE+ 4x SFP+ Network Switch w/ Power Cord
$43.95
Netgear Prosafe Plus JGS524PE 24 Port Gigabit Switch 12 Port PoE JGS524PE-100NAS
$129.98