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Exam Code: 100-105
Exam Name: Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)
Q&As: 332

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Question No : 13 – (Topic 1)  Which layer of the TCP/IP stack combines the OSI model physical and data link layers?
A. Internet layer
B. transport layer
C. application layer
D. network access layer
100-105 exam Answer: D
Explanation:
The Internet Protocol Suite, TCP/IP, is a suite of protocols used for communication over the
internet. The TCP/ IP model was created after the OSI 7 layer model for two major
reasons. First, the foundation of the Internet was built using the TCP/IP suite and through
the spread of the World Wide Web and Internet, TCP/IP has been preferred. Second, a
project researched by the Department of Defense (DOD) consisted of creating the TCP/IP
protocols. The DOD’s goal was to bring international standards which could not be met by
the OSI model.
Since the DOD was the largest software consumer and they preferred the TCP/IP suite,
most vendors used this model rather than the OSI. Below is a side by side comparison of
the TCP/IP and OSI models.

Question No : 14 – (Topic 1)  Refer to the exhibit.

The output is from a router in a large enterprise. From the output, determine the role of the
router.
A. A Core router.
B. The HQ Internet gateway router.
C. The WAN router at the central site.
D. Remote stub router at a remote site.
Answer: D
Explanation:
Since the routing table shows only a single default route using the single interface serial
0/0, we know that this is most likely a remote stub site with a single connection to the rest
of the network. All the other answer options would mean that this router would have more
connections, and would contain more routes.
Question No : 15 – (Topic 1)  Refer to the exhibit.

As packets travel from Mary to Robert, which three devices will use the destination MAC
address of the packet to determine a forwarding path? (Choose three.)
A. Hub1
B. Switch1
C. Router1
D. Switch2
E. Router2
F. Switch3
100-105 dumps Answer: B,D,F
Explanation:
Switches use the destination MAC address information for forwarding traffic, while routers
use the destination IP address information. Local Area Networks employ Layer 2 Switches and Bridges to forward and filter network traffic. Switches and Bridges operate at the Data Link Layer of the Open System Interconnect Model (OSI). Since Switches and Bridges operate at the Layer 2 they operate more intelligently than hubs, which work at Layer 1 (Physical Layer) of the OSI. Because the switches and bridges are able to listen to the traffic on the wire to examine the source and destination MAC address. Being able to listen to the traffic also allows the switches and bridges to compile a MAC address table to better filter and forward network traffic. To accomplish the above functions switches and bridges carry out the following tasks: MAC address learning by a switch or a bridge is accomplished by the same method. The switch or bridge listens to each device connected to each of its ports and scan the incoming frame for the source MAC address. This creates a MAC address to port map that is cataloged in the switches/bridge MAC database. Another name for the MAC address table is content addressable memory or CAM table. When a switch or bridge is listening to the network traffic, it receives each frame and compares it to the MAC address table. By checking the MAC table the switch/ bridge are  able o determine which port the frame came in on. If the frame is on the MAC table the frame is filtered or transmitted on only that port. If the switch determines that the frame is not on the MAC table, the frame is forwarded out to all ports except the incoming port.
Question No : 16 – (Topic 1)   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.
Which two statements describe the operation of the CSMA/CD access method? (Choose two.)
A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
C. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.
D. After a collision, the station that detected the collision has first priority to resend the lost data.
E. 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.
F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.
Answer: B,E
Explanation:
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.

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