product description d link dir 879 wireless router 80211a b g n ac desktop device type wireless router 4 port switch integrated enclosure type desktop data link protocol ethernet fast ethernet gigabit ethernet ieee 80211b ieee 80211a ieee 80211g ieee 80211n ieee 80211ac frequency band 24 ghz 5 ghz data transfer rate 1900 mbps features nat support stateful packet inspection spi ipv6 support vpn passthrough parental control quality of servic