Autonegotiation has been done for the interface duplex. The majority of Ethernet interfaces allow for manual configuration of the interface speed and duplex as well as automatic configuration via automatic negotiation (802.3u). The words "a-full" and "1000" are displayed on the Gi0/6 interface. This indicates that the interface speed has been manually defined with the speed 1000 command while the interface duplex has been automatically negotiated.
When using the show ip interface short command, both A and B can produce a UP/UP status. A layer 3 ping might not succeed, though. A DOWN/DOWN state will follow from disconnecting the wire. "10.100.73.0/24 [110/46] through 10.10.10.2, 00:00:01, GigabitEthernet0/1," reads the OSPF entry. The destination network mentioned is 10.100.73.0 with a prefix length of /24, which is also represented by the number 255.255.255.0 in dotted-decimal notation. Although external CSU/DSUs are still installed, current routers frequently have CSU/DSUs incorporated into the card. In these cases, a serial cable is used to connect a router to the CSU/DSU.
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