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Cisco 100-105 ICND1 Online Exam Practice Questions
QUESTION 1
Which two statements describe the operation of the CSMA/CD access method? (Choose two.)
A. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations
have equal priority to transmit data.
B. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
C. After a collision, the station that detected the collision has first priority to resend the lost data.
D. The use of hubs to enlarge the size of collision domain is one way to improve the operation of the CSMA/CD access
method.
E. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to
transmitting data.
F. In a CSMA/CD collision domain, stations must wait until media is not in use before transmitting.
Correct Answer: AF
Ethernet networking uses Carrier Sense Multiple Access with Collision Detect (CSMA/CD), a protocol that helps devices
share the bandwidth evenly without having two devices transmit at the same time on the network medium. CSMA/CD
was created to overcome the problem of those collisions that occur when packets are transmitted simultaneously from
different nodes. And trust me, good collision management is crucial, because when a node transmits in a CSMA/CD
network, all the other nodes on the network receive and examine that transmission. Only bridges and routers can
effectively prevent a transmission from propagating throughout the entire network! So, how does the CSMA/CD protocol
work? Like this: when a host wants to transmit over the network, it first checks for the presence of a digital signal on the
wire. If all is clear (no other host is transmitting), the host will then proceed with its transmission. But it doesn\\’t stop
there. The transmitting host constantly monitors the wire to make sure no other hosts begin transmitting. If the host
detects another signal on the wire, it sends out an extended jam signal that causes all nodes on the segment to stop
sending data (think, busy signal). The nodes respond to that jam signal by waiting a while before attempting to transmit
again. Backoff algorithms determine when the colliding stations can retransmit. If collisions keep occurring after 15 tries,
the nodes attempting to transmit will then time out.
QUESTION 2
Which one of the following IP addresses is the last valid host in the subnet using mask 255.255.255.224?
A. 192.168.2.63
B. 192.168.2.62
C. 192.168.2.61
D. 192.168.2.60
E. 192.168.2.32
Correct Answer: B
With the 224 there are 8 networks with increments of 32 One of these is 32 33 62 63 where 63 is broadcast so 62 is last
valid host out of given choices.
QUESTION 3
What interfaces on Router1 have not had any configurations applied? (Choose two.)
A. Ethernet 0
B. FastEthernet 0/0
C. FastEthernet 0/1
D. Serial 0
E. Serial 0/0
F. Serial 0/1
Correct Answer: BF
User the “show ip interface brief” command
Notice that Router1 does not have Ethernet 0 and Serial 0 interfaces. FastEthernet 0/1 and Serial 0/0 were configured
with their IP addresses therefore only FastEthernet 0/0 and Serial0/1 have not had any configurations applied.
QUESTION 4
Which value represents a host route?
A. 192.168.1.0/30
B. 192.168.1.0/24
C. 192.168.1.2/31
D. 192.168.1.0/32
Correct Answer: D
QUESTION 5
A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve
the reliability of this communication session?
A. decrease the window size
B. use a different source port for the session
C. decrease the sequence number
D. obtain a new IP address from the DHCP server
E. start a new session using UDP
Correct Answer: A
QUESTION 6
You recently applied a common configuration to several PCs on different VLANs. The PCs are connected to the same
switch with a router-on-a-stick, but users report that the PCs cannot ping one another. Which two are possible reasons
for the problem? (Choose two.)
A. The access ports on the PCs are misconfigured.
B. The native VLAN on the router is misconfigured.
C. The ip default-network command is misconfigured on the router.
D. The trunking protocol is configured incorrectly on the router subinterfaces.
E. The VLAN is configured incorrectly on the router subinterfaces.
Correct Answer: AE
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