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Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)

Question No: 1 – (Topic 1)

Refer to the exhibit.

image

What must be configured to establish a successful connection from Host A to switch SW-A through router RT-A?

  1. VLAN 1 on RT-A

  2. IP routing on SW-A

  3. default gateway on SW-A

  4. crossover cable connecting SW-A and RT-A

Answer: C Explanation:

In order for the switch to reach networks that are not local, such as networks attached to different interfaces of the router, it will need to set its default gateway to be the IP address of the attached router.

Question No: 2 – (Topic 1)

Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt required?

  1. HTTP

  2. IP

  3. TCP

  4. Telnet

  5. UDP

Answer: E Explanation:

UDP provides a connectionless datagram service that offers best-effort delivery, which means that UDP does not guarantee delivery or verify sequencing for any datagrams. A source host that needs reliable communication must use either TCP or a program that provides its own sequencing and acknowledgment services.

Question No: 3 – (Topic 1)

How does a switch differ from a hub?

  1. A switch does not induce any latency into the frame transfer time.

  2. A switch tracks MAC addresses of directly-connected devices.

  3. A switch operates at a lower, more efficient layer of the OSI model.

  4. A switch decreases the number of broadcast domains.

  5. A switch decreases the number of collision domains.

Answer: B Explanation:

Some of the features and functions of a switch include:

A switch is essentially a fast, multi-port bridge, which can contain dozens of ports. Rather than creating two collision domains, each port creates its own collision domain.

In a network of twenty nodes, twenty collision domains exist if each node is plugged into its own switch port.

If an uplink port is included, one switch creates twenty-one single-node collision domains. A switch dynamically builds and maintains a Content-Addressable Memory (CAM) table, holding all of the necessary MAC information for each port.

For a detailed description of how switches operate, and their key differences to hubs, see the reference link below.

Reference: http://www.cisco.com/warp/public/473/lan-switch-cisco.shtml

Question No: 4 – (Topic 1)

Refer to the exhibit.

image

SwitchA receives the frame with the addressing shown. According to the command output also shown in the exhibit, how will SwitchA handle this frame?

  1. It will drop the frame.

  2. It will forward the frame out port Fa0/6 only.

  3. It will flood the frame out all ports.

  4. It will flood the frame out all ports except Fa0/3.

Answer: B Explanation:

Switches keep the learned MAC addresses in a table, so that when a frame comes in with a destination MAC address that the switch has already learned, it will forward it to that port only. If a frame comes in with a destination MAC that is not already in the MAC address table, then the frame will be flooded to all ports except for the one that it came in on. In this case, Switch A already knows that 00b0.d0da.cb56 resides on port fa0/6, so it will forward the from out that port.

Question No: 5 – (Topic 1)

Refer to the exhibit.

image

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.)

  1. Hub1

  2. Switch1

  3. Router1

  4. Switch2

  5. Router2

  6. Switch3

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: 6 – (Topic 1)

A workstation has just resolved a browser URL to the IP address of a server. What protocol will the workstation now use to determine the destination MAC address to be placed into frames directed toward the server?

  1. HTTP

  2. DNS

  3. DHCP

  4. RARP

  5. ARP

Answer: E Explanation:

The RARP protocol is used to translate hardware interface addresses to protocol addresses. The RARP message format is very similar to the ARP format. When the booting computer sends the broadcast ARP request, it places its own hardware address in both the sending and receiving fields in the encapsulated ARP data packet. The RARP server will fill in the correct sending and receiving IP addresses in its response to the message. This way the booting computer will know its IP address when it gets the message from the RARP server

Question No: 7 – (Topic 1)

Refer to the exhibit.

image

The exhibit is showing the topology and the MAC address table. Host A sends a data frame to host D. What will the switch do when it receives the frame from host A?

  1. The switch will add the source address and port to the MAC address table and forward the frame to host D.

  2. The switch will discard the frame and send an error message back to host A.

  3. The switch will flood the frame out of all ports except for port Fa0/3.

  4. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D.

Answer: A Explanation:

When switch receives the data frame from the host not having the MAC address already on the MAC table, it will add the MAC address to source port on MAC address table and sends the data frame.

Question No: 8 – (Topic 1)

Refer to the exhibit.

image

The output is from a router in a large enterprise. From the output, determine the role of the router.

  1. A Core router.

  2. The HQ Internet gateway router.

  3. The WAN router at the central site.

  4. 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: 9 – (Topic 1)

Which protocol uses a connection-oriented service to deliver files between end systems?

  1. TFTP

  2. DNS

  3. FTP

  4. SNMP

  5. RIP

Answer: C Explanation:

TCP is an example of a connection-oriented protocol. It requires a logical connection to be established between the two processes before data is exchanged. The connection must be maintained during the entire time that communication is taking place, then released afterwards. The process is much like a telephone call, where a virtual circuit is established-

-the caller must know the person#39;s telephone number and the phone must be answered before the message can be delivered.

TCP/IP is also a connection-oriented transport with orderly release. With orderly release, any data remaining in the buffer is sent before the connection is terminated. The release is accomplished in a three-way handshake between client and server processes. The connection-oriented protocols in the OSI protocol suite, on the other hand, do not support orderly release. Applications perform any handshake necessary for ensuring orderly release.

Examples of services that use connection-oriented transport services are telnet, rlogin, and ftp.

Question No: 10 – (Topic 1)

Refer to the exhibit.

image

A network has been planned as shown. Which three statements accurately describe the areas and devices in the network plan? (Choose three.)

  1. Network Device A is a switch.

  2. Network Device B is a switch.

  3. Network Device A is a hub.

  4. Network Device B is a hub.

  5. Area 1 contains a Layer 2 device.

  6. Area 2 contains a Layer 2 device.

Answer: A,D,E Explanation:

Switches use a separate collision domain for each port, so device A must be a switch. Hubs, however, place all ports in the same collision domain so device B is a hub. Switches reside in layer 2 while hubs are layer 1 devices.

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