Cisco 200-120 Online Practice Questions and Exam Preparation

Cisco 200-120 Online Questions & Answers

• Question 231:

  Refer to the exhibit.

  

  What two results would occur if the hub were to be replaced with a switch that is configured with one Ethernet VLAN? (Choose two.)

  A. The number of collision domains would remain the same.
  B. The number of collision domains would decrease.
  C. The number of collision domains would increase.
  D. The number of broadcast domains would remain the same.
  E. The number of broadcast domains would decrease.
  F. The number of broadcast domains would increase.
  C. The number of collision domains would increase.
  D. The number of broadcast domains would remain the same.

  ---

  Basically, a collision domain is a network segment that allows normal network traffic to flow back and forth. In the old days of hubs, this meant you had a lot of collisions, and the old CSMA/CD would be working overtime to try to get those

  packets re-sent every time there was a collision on the wire (since Ethernet allows only one host to be transmitting at once without there being a traffic jam). With switches, you break up collision domains by switching packets bound for other

  collision domains. These days, since we mostly use switches to connect computers to the network, you generally have one collision domain to a PC.

  Broadcast domains are exactly what they imply: they are network segments that allow broadcasts to be sent across them. Since switches and bridges allow for broadcast traffic to go unswitched, broadcasts can traverse collision domains

  freely. Routers, however, don't allow broadcasts through by default, so when a broadcast hits a router (or the perimeter of a VLAN), it doesn't get forwarded. The simple way to look at it is this way: switches break up collision domains, while

  routers (and VLANs) break up collision domains and broadcast domains. Also, a broadcast domain can contain multiple collision domains, but a collision domain can never have more than one broadcast domain associated with it.

  Collision Domain: A group of Ethernet or Fast Ethernet devices in a CSMA/CD LAN that are connected by repeaters and compete for access on the network. Only one device in the collision domain may transmit at any one time, and the other

  devices in the domain listen to the network in order to avoid data collisions. A collision domain is sometimes referred to as an Ethernet segment.

  Broadcast Domain: Broadcasting sends a message to everyone on the local network (subnet). An example for Broadcasting would be DHCP Request from a Client PC. The Client is asking for a IP Address, but the client does not know how to

  reach the DHCP Server. So the client sends a DHCP Discover packet to EVERY PC in the local subnet (Broadcast). But only the DHCP Server will answer to the Request.

  How to count them?

  Broadcast Domain:

  No matter how many hosts or devices are connected together, if they are connected with a repeater, hub, switch or bridge, all these devices are in ONE Broadcast domain (assuming a single VLAN). A Router is used to separate Broadcast-

  Domains (we could also call them Subnets - or call them VLANs).

  So, if a router stands between all these devices, we have TWO broadcast domains.

  Collision Domain:

  Each connection from a single PC to a Layer 2 switch is ONE Collision domain. For example, if 5 PCs are connected with separate cables to a switch, we have 5 Collision domains. If this switch is connected to another switch or a router, we

  have one collision domain more.

  If 5 Devices are connected to a Hub, this is ONE Collision Domain. Each device that is connected to a Layer 1 device (repeater, hub) will reside in ONE single collision domain.

• Question 232:

  Which two commands correctly verify whether port security has been configured on port FastEthernet 0/12 on a switch? (Choose two.)

  A. SW1#show port-secure interface FastEthernet 0/12
  B. SW1#show switchport port-secure interface FastEthernet 0/12
  C. SW1#show running-config
  D. SW1#show port-security interface FastEthernet 0/12
  E. SW1#show switchport port-security interface FastEthernet 0/12
  C. SW1#show running-config
  D. SW1#show port-security interface FastEthernet 0/12

  ---

  We can verify whether port security has been configured by using the "show running-config" or "show port-security interface" for more detail. An example of the output of "show port-security interface" command is shown below:

  

• Question 233:

  The network administrator cannot connect to Switch1 over a Telnet session, although the hosts attached to Switch1 can ping the interface Fa0/0 of the router.

  

  Given the information in the graphic and assuming that the router and Switch2 are configured properly, which of the following commands should be issued on Switch1 to correct this problem?

  A. Switch1(config)# line con0 Switch1(config-line)# password cisco Switch1(config-line)#login
  B. Switch1(config)# interface fa0/1 Switch1(config-if)# ip address 192.168.24.3 255.255.255.0
  C. Switch1(config)# ip default-gateway 192.168.24.1
  D. Switch1(config)# interface fa0/1 Switch1(config-if)# duplex full Switch1(config-if)# speed 100
  E. Switch1(config)# interface fa0/1 Switch1(config-if)# switchport mode trunk
  C. Switch1(config)# ip default-gateway 192.168.24.1

  ---

  Since we know hosts can reach the router through the switch, we know that connectivity, duplex. Speed, etc. are good. However, for the switch itself to reach networks outside the local one, the ip default-gateway command must be used.

• Question 234:

  Refer to the exhibit.

  

  Based on the information given, which switch will be elected root bridge and why?

  A. Switch A, because it has the lowest MAC address
  B. Switch A, because it is the most centrally located switch
  C. Switch B, because it has the highest MAC address
  D. Switch C, because it is the most centrally located switch
  E. Switch C, because it has the lowest priority
  F. Switch D, because it has the highest priority
  E. Switch C, because it has the lowest priority

  ---

  To elect the root bridge in the LAN, first check the priority value. The switch having the lowest priority will win the election process. If Priority Value is the same then it checks the MAC Address; the switch having the lowest MAC Address will become the root bridge. In this case, switch C has the lowest MAC Address so it becomes the root bridge.

• Question 235:

  Which command can you use to manually assign a static IPv6 address to a router interface?

  A. ipv6 autoconfig 2001:db8:2222:7272::72/64
  B. ipv6 address 2001:db8:2222:7272::72/64
  C. ipv6 address PREFIX_1 ::1/64
  D. ipv6 autoconfig
  B. ipv6 address 2001:db8:2222:7272::72/64

  ---

  To assign an IPv6 address to an interface, use the "ipv6 address" command and specify the IP address you wish to use.

• Question 236:

  Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two.)

  A. The transport layer divides a data stream into segments and may add reliability and flow control information.
  B. The data link layer adds physical source and destination addresses and an FCS to the segment.
  C. Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.
  D. Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
  E. The presentation layer translates bits into voltages for transmission across the physical link.
  A. The transport layer divides a data stream into segments and may add reliability and flow control information.
  D. Packets are created when the network layer adds Layer 3 addresses and control information to a segment.

  ---

  The transport layer segments data into smaller pieces for transport. Each segment is assigned a sequence number, so that the receiving device can reassemble the data on arrival.

  The transport layer also use flow control to maximize the transfer rate while minimizing the requirements to retransmit. For example, in TCP, basic flow control is implemented by acknowledgment by the receiver of the receipt of data; the

  sender waits for this acknowledgment before sending the next part.

  The Network layer (Layer 3) has two key responsibilities. First, this layer controls the logical addressing of devices. Second, the network layer determines the best path to a particular destination network, and routes the data appropriately.

• Question 237:

  Refer to the exhibit.

  

  What is the reason that the interface status is "administratively down, line protocol down"?

  A. There is no encapsulation type configured.
  B. There is a mismatch in encapsulation types.
  C. The interface is not receiving any keepalives.
  D. The interface has been configured with the shutdown command.
  E. The interface needs to be configured as a DTE device.
  F. The wrong type of cable is connected to the interface.
  D. The interface has been configured with the shutdown command.

  ---

  Interfaces can be enabled or disabled with shutdown/no shutdown command. If you interface is down, it will display administratively down status. You can bring up an interface having administratively down interface using no shutdown command.

• Question 238:

  In a switched environment, what does the IEEE 802.1Q standard describe?

  A. the operation of VTP
  B. a method of VLAN trunking
  C. an approach to wireless LAN communication
  D. the process for root bridge selection
  E. VLAN pruning
  B. a method of VLAN trunking

  ---

  A broadcast domain must sometimes exist on more than one switch in the network. To accomplish this, one switch must send frames to another switch and indicate which VLAN a particular frame belongs to. On Cisco switches, a trunk link is created to accomplish this VLAN identification. ISL and IEEE 802.1Q are different methods of putting a VLAN identifier in a Layer 2 frame. The IEEE 802.1Q protocol interconnects VLANs between multiple switches, routers, and servers. With 802.1Q, a network administrator can define a VLAN topology to span multiple physical devices. Cisco switches support IEEE 802.1Q for FastEthernet and Gigabit Ethernet interfaces. An 802.1Q trunk link provides VLAN identification by adding a 4-byte tag to an Ethernet Frame as it leaves a trunk port.

• Question 239:

  What is the correct routing match to reach 172.16.1.5/32?

  A. 172.16.1.0/26
  B. 172.16.1.0/25
  C. 172.16.1.0/24
  D. the default route
  A. 172.16.1.0/26

• Question 240:

  If primary and secondary root switches with priority 16384 both experience catastrophic losses, which tertiary switch can take over?

  A. a switch with priority 20480
  B. a switch with priority 8192
  C. a switch with priority 4096
  D. a switch with priority 12288
  A. a switch with priority 20480