Fundamentals Flashcards
What are the two types of port queues on a switchport?
ingrees queues, and egress queues.
What is the max cable length of most X-BASE-T wiring?
100m (328 ft)
ACLs on a switch can identify frames based on what 5 features?
MAC address, non-IP protocol types, IP Addresses, Protocols, and Layer-4 port numbers.
If an error is detected on a switchport what happens to it?
It is placed in the errdisable state, and disabled.
What is the IEEE standard for 10 GigE?
802.3ae
If set to automatic recovery, an errdisabled port will stay down for how long? What is the range for configuring this time?
300 seconds, and 30-86,400 seconds.
What is the IEEE standard for Gigabit Ethernet? (over copper)
802.3ab
What is the IEEE standard for FastEthernet?
802.3u
Is duplex autonegotiation possible on Gigabit Ethernet?
No, because Gigabit Ethernet is, by definition, Full Duplex.
What is the IEEE standard for Gigabit Ethernet? (over fiber)
802.3z
What are the two Physical classifications of 10 GigE?
-LAN PHY, Connects switches, usually in the Core layer.-WAN PHY, Connects to SONET or SDH networks, typically in MANs.
Define auto-negotiation
Ethernet process by which devices attached to the same cable negotiate their speed and the duplex settings over the cable.
Define half duplex
Ethernet feature in which a NIC or Ethernet port can only transmit or receive at the same instant in time, but not both. Half duplex is required when a possibility of collisions exists.
Define full duplex
Ethernet feature in which a NIC or Ethernet port can both transmit and receive at the same instant in time. It can be used only when there is no possibility of collisions. Loopback circuitry on NIC cards is disabled to use full duplex.
Define crossover cable
Copper cable with RJ-45 connectors in which a twisted pair at pins 1,2 on the first end of the cable is connected to pins 3,6 on the other end, with a second pair connected to pins 3,6 on the first end and pins 1,2 on the other end.
Define straight-through cable
Copper cable with RJ-45 connectors in which the wire at pin 1 on one end is connected to pin 1 on the other end; the wire at pin 2 is connected to pin 2 on the other end; and so on.
Define loopback circuitry
A feature of Ethernet NICs. When the NIC transmits an electrical signal, it “loops” the transmitted electrical current back onto the receive pair. By doing so, if another NIC transmits a frame at the same time, the NIC can detect the overlapping received electrical signals, and sense that a collision has occurred.
Which feature describes MAC addresses that are dynamically learned or manually configured, stored in the address table, and added to the running configuration?
sticky
Each switch port is a _____ ______
collision domain
When a host is connected to a switchport, why aren’t frame errors propagated?
because each frame is checked