Q&A 207
14
If a switch hears three different configuration BPDUs from three different neighbors on
three different interfaces, and if all three specify that Bridge 1 is the root, how does the
switch choose which interface is its root port?
15
How does a transparent bridge build its address table?
16
How many bytes long is a MAC address?
17
Assume that a building has 100 devices attached to the same Ethernet. These users then
are migrated onto two separate Ethernet segments, each with 50 devices and separated by
a router. List two benefits that would be derived for a typical user.
18
Does a bridge/switch examine just the incoming frame's source MAC, destination MAC,
or both? Why does it examine the one(s) it examines?
19
Define the term collision domain.
20
When a bridge or switch using Spanning-Tree Protocol first initializes, who does it assert
should be the root of the tree?
21
Name the three reasons why a port is placed in forwarding state as a result of Spanning
Tree.
22
Define the difference between broadcast and multicast MAC addresses.
23
Excluding the preamble and starting delimiter fields, but including all other Ethernet
headers and trailers, what is the maximum number of bytes in an Ethernet frame?
24
Define the term broadcast domain.
25
Describe the benefits of creating three VLANs of 25 ports each, versus a single VLAN of
75 ports, in each case using a single switch. Assume that all ports are switched ports (each
port is a different collision domain).
26
If two Cisco LAN switches are connected using Fast Ethernet, what VLAN trunking
protocols could be used? If only one VLAN spanned both switches, is a VLAN trunking
protocol needed?
27
Explain the function of the loopback and collision detection features of an Ethernet NIC
in relation to half-duplex and full-duplex operation.
28
Name the three interface states that the Spanning-Tree Protocol uses, other than
forwarding. Which of these states is transitory?
29
What are the two reasons that a nonroot bridge/switch places a port in forwarding state?
30
Can the root bridge/switch ports be placed in blocking state?
31
How many IP addresses must be configured for network management on a Cisco Catalyst
1900 switch if eight ports are to be used and with three VLANs?
ch04.fm Page 207 Monday, March 20, 2000 5:02 PM