Concepts of Ethernet with Switches

1. Which of the following Ethernet standards support a maximum cable length of longer
than 100 meters? (Choose two answers.)
a. 100BASE-T
b. 1000BASE-LX
c. 1000BASE-T
d. 100BASE-FX
2. Which of the following statements describes part of the process of how a LAN switch
decides to forward a frame destined for a broadcast MAC address?
a. It compares the unicast destination address to the bridging, or MAC address, table.
b. It compares the unicast source address to the bridging, or MAC address, table.
c. It forwards the frame out all interfaces in the same VLAN except for the incoming
interface.
d. It compares the destination IP address to the destination MAC address.
e. It compares the frame’s incoming interface to the source MAC entry in the MAC
address table.

3. Which of the following statements best describes what a switch does with a frame destined
for an unknown unicast address?
a. It forwards out all interfaces in the same VLAN except for the incoming interface.
b. It forwards the frame out the one interface identified by the matching entry in the
MAC address table.
c. It compares the destination IP address to the destination MAC address.
d. It compares the frame’s incoming interface to the source MAC entry in the MAC
address table.
4. Which of the following comparisons does a switch make when deciding whether a new
MAC address should be added to its MAC address table?
a. It compares the unicast destination address to the bridging, or MAC address, table.
b. It compares the unicast source address to the bridging, or MAC address, table.
c. It compares the VLAN ID to the bridging, or MAC address, table.
d. It compares the destination IP address’s ARP cache entry to the bridging, or MAC
address, table.

5. Which of the following statements describes part of the process of how a switch decides
to forward a frame destined for a known unicast MAC address?
a. It compares the unicast destination address to the bridging, or MAC address, table.
b. It compares the unicast source address to the bridging, or MAC address, table.
c. It forwards the frame out all interfaces in the same VLAN except for the incoming
interface.
d. It compares the destination IP address to the destination MAC address.
e. It compares the frame’s incoming interface to the source MAC entry in the MAC
address table.
5. PC1, with MAC address 1111.1111.1111, is connected to Switch SW1’s Fa0/1 interface.
PC2, with MAC address 2222.2222.2222, is connected to SW1’s Fa0/2 interface. PC3,
with MAC address 3333.3333.3333, connects to SW1’s Fa0/3 interface. The switch begins
with no dynamically learned MAC addresses, followed by PC1 sending a frame with a destination address of 2222.2222.2222. If the next frame to reach the switch is a frame sent
by PC3, destined for PC2’s MAC address of 2222.2222.2222, which of the following are
true? (Choose two answers.)
a. The switch forwards the frame out interface Fa0/1.
b. The switch forwards the frame out interface Fa0/2.
c. The switch forwards the frame out interface Fa0/3.
d. The switch discards (filters) the frame.

7. Which of the following devices would be in the same broadcast domain as PC1? (Choose
three answers.)
a. PC2, which is separated from PC1 by an Ethernet hub
b. PC3, which is separated from PC1 by a transparent bridge
c. PC4, which is separated from PC1 by an Ethernet switch
d. PC5, which is separated from PC1 by a router
9. A Cisco LAN switch connects to three PCs (PC1, PC2, and PC3), each directly using a
cable that supports Ethernet UTP speeds up through 1000 Mbps (1 Gbps). PC1 uses a NIC
that supports only 10BASE-T, while PC2 has a 10/100 NIC, and PC3 has a 10/100/1000
NIC. Assuming that the PCs and switch use IEEE autonegotiation, which PCs will use
half-duplex?
a. PC1
b. PC2
c. PC3
d. None of the PCs will use half-duplex.

6. Which of the following devices would be in the same collision domain as PC1?
a. PC2, which is separated from PC1 by an Ethernet hub
b. PC3, which is separated from PC1 by a transparent bridge
c. PC4, which is separated from PC1 by an Ethernet switch
d. PC5, which is separated from PC1 by a router