Chapter 12: Basic Switching and Switch Configuration
TRUE/FALSE
1. Routers, switches, bridges, and gateways segment networks and thus create separate collision domains.
2. When a segment has too much broadcast traffic, utilization increases and network performance in
general benefits.
3. IEEE 802.3u specifies two types of repeaters: Class I and Class II. Class II repeaters have higher
latency than Class I repeaters.
4. The main difference between a switch and a bridge is that the switch typically connects multiple
stations individually, thereby segmenting a LAN into multiple collision domains.
5. You cannot actually configure a router until you get to enable mode.
MULTIPLE CHOICE
1. A(n) ____ is the physical area in which a packet collision might occur.
a.
backoff domain
c.
IPG domain
b.
collision domain
d.
jam domain
2. Stations on a network ____ packets to other stations to make their presence known on the network and
to carry out normal network tasks such as IP address-to-MAC address resolution.
a.
broadcast
c.
multicast
b.
unicast
d.
anycast
3. ____ refers to the amount of time required to transmit one data bit on a network.
a.
Transmission time
c.
Latency
b.
Slot time
d.
Bit time
4. ____ specifies that all collisions should be detected from anywhere in a network in less time than is
required to place a 64-byte frame on the network.
a.
Latency
c.
Slot time
b.
Transmission time
d.
Bit time
5. A ____ error indicates that bits of a frame were corrupted during transmission,
a.
frame check sequence (FCS)
c.
long frame
b.
jabber
d.
short frame
6. A(n) ____ occurs when two stations transmit more than 64 bytes of data frames before detecting a
collision.
a.
jabber
c.
late collision
b.
NIC error
d.
alignment error
7. A bridge maintains a ____ that maps the MAC addresses on each segment to the corresponding port on
the bridge to which each segment is connected.
a.
multicast table
c.
bandwidth table
b.
map table
d.
bridging table
8. A ____ operates at layer 3 of the OSI reference model. It interprets the Network layer protocol and
makes forwarding decisions based on the layer 3 address.
a.
switch
c.
bridge
b.
router
d.
hub
9. In ____ memory buffering, each port has a certain amount of memory that it can use to store frames.
a.
exclusive
c.
port-based
b.
shared
d.
content-addressable
10. With ____ memory buffering, any port can store frames in the shared memory buffer.
a.
content-addressable
c.
port-based
b.
shared
d.
exclusive
11. Some switches can interconnect network interfaces of different speeds. These switches use ____
switching and, typically, a shared memory buffer.
a.
symmetric
c.
virtual
b.
shared
d.
asymmetric
12. Switches that use ____ forwarding start sending a frame immediately after reading the destination
MAC address into their buffers.
a.
cut-through
c.
fragment-free
b.
store-and-forward
d.
adaptive cut-through forwarding
13. ____ switches read the entire frame, no matter how large, into their buffers before forwarding.
a.
Fast-forward
c.
fragment-free
b.
Store-and-forward
d.
cut-through
14. ____ represents an effort to provide more error-reducing benefits than cut-through switching, while
keeping latency lower than does store-and-forward switching.
a.
Fragment-free forwarding
c.
Adaptive cut-through forwarding
b.
Fast forwarding
d.
Adaptive fast forwarding
15. Fragment-free switches are also known as ____ switches.
a.
fast forwarding
c.
cut-through
b.
error sensing
d.
modified cut-through
16. Two types of operating systems are in use on Cisco switches: IOS-based and ____.
a.
terminal-based
c.
set-based
b.
command-based
d.
prompt-based
17. To enter enable mode, type ____ at the command-line prompt and then press Enter.
a.
enable
c.
enable on
b.
mode –enable
d.
set enable
18. To start configuration mode, first type ____ at the command prompt.
a.
cfg trmnl
c.
config t
b.
config tty
d.
cfg t
19. Generally speaking, a switch does not require an IP address, because switches operate mainly on Layer
2 (____ addresses).
a.
IP
c.
IPX
b.
TCP
d.
MAC
20. To view the configuration of a port, use the ____ command.
a.
display
c.
interface
b.
show
d.
port
21. Cisco uses the term ____ to refer to the process by which a switch learns addresses on its own.
a.
ipg learn
c.
sticky learn
b.
switch learn
d.
sticky memory
COMPLETION
1. ____________________ is a network access method (or media access method) originated by the
University of Hawaii, later adopted by Xerox Corporation, and standardized as IEEE 802.3 in the early
1980s.
2. The amount of time it takes for a packet to be sent from one device to another is called the
____________________.
3. In ____________________ communications, devices can send and receive signals, but not at the same
time.
4. In ____________________ communications, devices can send and receive signals simultaneously.
5. The MAC-to–switch-port mapping is stored in the switch’s ______________________________.
ANS:
MATCHING
Match each item with a statement below:
a.
CSMA/CD
f.
Bridge
b.
Broadcast storm
g.
Symmetric switching
c.
Latency
h.
Adaptive cut-through forwarding
d.
5-4-3 rule
i.
VLAN
e.
Alignment error
1. a frame with an FCS error and an octet missing
2. virtual local area network that allows you to logically segment a network
3. switches that require all attached network interface devices to use the same transmit/receive speed
4. a sudden rush of network transmissions that causes all other network communications to slow down
due to the volume of data competing for access to the same bandwidth on the communications medium
5. segments a network by filtering traffic at the Data Link layer
6. the length of time that is required to forward, send, or otherwise propagate a data frame
7. also known as error sensing
8. limits collision domains to five segments of wire, four repeaters and/or hubs, and three populated hubs
between any two stations on a 10-Mbps network
9. Ethernet contention method
SHORT ANSWER
1. How are collisions handled by CSMA/CD?
2. Describe a simple way to reduce broadcast traffic.
3. What are some of the frame size errors that occur on Ethernet networks?
4. What are the three defined implementations of Fast Ethernet?
5. What are the Gigabit Ethernet specifications and the governing IEEE standards?
6. What are the benefits of using full-duplex?
7. What are the benefits provided by switches?
8. Describe cut-through forwarding switching.
9. How can you set the host name on a Cisco Catalyst switch?
10. Describe the violation command for configuring port security.