Introduction to Networks Final Exam Part 5

138. Refer to the exhibit. Which protocol was responsible for building the table that is shown?  DHCP  ARP  DNS  ICMP 139. A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)  crosstalk  extended length of cabling  RFI  EMI  signal attenuation 140. A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address? A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in the ARP cache. How will the device obtain a destination MAC address?  It will send the frame and use its own MAC address as the destination.  It will send an ARP request for the MAC address of the destination device.  It will send the frame with a broadcast MAC address.  It will send a request to the DNS server for the destination MAC address.  It will send an ARP request for the MAC address of the default gateway. 141. Which two functions are performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication?  integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper  enables IPv4 and IPv6 to utilize the same physical medium  handles communication between upper layer networking software and Ethernet NIC hardware  adds Ethernet control information to network protocol data  implements CSMA/CD over legacy shared half-duplex media 142. A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?  DNS  NetBIOS (NetBT)  POP3  IMAP 143. A network administrator is adding a new LAN to a branch ofÏce. The new LAN must support 25 connected devices. What is the smallest network mask that the network administrator can use for the new network?  255.255.255.128  255.255.255.192  255.255.255.224  255.255.255.240 144. What characteristic describes a Trojan horse?  malicious software or code running on an end device  an attack that slows or crashes a device or network service  the use of stolen credentials to access private data  a network device that filters access and traffic coming into a network 145. What service is provided by HTTPS?  Uses encryption to provide secure remote access to network devices and servers.  Resolves domain names, such as cisco.com, into IP addresses.  Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.  Allows remote access to network devices and servers. 146. A technician with a PC is using multiple applications while connected to the Internet. How is the PC able to keep track of the data flow between multiple application sessions and have each application receive the correct packet flows?  The data flow is being tracked based on the destination MAC address of the technician PC.  The data flow is being tracked based on the source port number that is used by each application.*  The data flow is being tracked based on the source IP address that is used by the PC of the technician.  The data flow is being tracked based on the destination IP address that is used by the PC of the technician. Explanation: The source port number of an application is randomly generated and used to individually keep track of each session connecting out to the Internet. Each application will use a unique source port number to provide simultaneous communication from multiple applications through the Internet. 147. A network administrator is adding a new LAN to a branch office. The new LAN must support 61 connected devices. What is the smallest network mask that the network administrator can use for the new network?  255.255.255.240  255.255.255.224  255.255.255.192  255.255.255.128 148. Refer to the exhibit. Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network. (Not all options are used.) Question Answer Explanation: Network A needs to use 192.168.0.0 /25 which yields 128 host addresses. Network B needs to use 192.168.0.128 /26 which yields 64 host addresses. Network C needs to use 192.168.0.192 /27 which yields 32 host addresses. Network D needs to use 192.168.0.224 /30 which yields 4 host addresses. 149. What characteristic describes a DoS attack?  the use of stolen credentials to access private data  a network device that filters access and traffic coming into a network  software that is installed on a user device and collects information about the user  an attack that slows or crashes a device or network service 150. Match the application protocols to the correct transport protocols 151. What service is provided by SMTP?  Allows clients to send email to a mail server and the servers to send email to other servers.  Allows remote access to network devices and servers.  Uses encryption to provide secure remote access to network devices and servers.  An application that allows real-time chatting among remote users. 152. Match a statement to the related network model. (Not all options are used.) Place the options in the following order:peer-to-peer network [+] no dedicated server is required [+] client and server roles are set on a per request basis peer-to-peer aplication [#] requires a specific user interface [#] a background service is required Explain: Peer-to-peer networks do not require the use of a dedicated server, and devices can assume both client and server roles simultaneously on a per request basis. Because they do not require formalized accounts or permissions, they are best used in limited situations. Peer-to-peer applications require a user interface and background service to be running, and can be used in more diverse situations. 153. Match the application protocols to the correct transport protocols.  Question  Answer 154. Refer to the exhibit. A network engineer has been given the network address of 192.168.99.0 and a subnet mask of 255.255.255.192 to subnet across the four networks shown. How many total host addresses are unused across all four subnets?  88  200  72  224  158 156. Which connector is used with twisted-pair cabling in an Ethernet LAN? LC conector SC conector BNC RJ 11 True Answer: RJ 45 (true answer) 157. A client packet is received by a server. The packet has a destination port number of 22. What service is the client requesting?  SSH  SMB/CIFS  HTTPS  SLP 158. What characteristic describes an IPS?  a tunneling protocol that provides remote users with secure access into the network of an organization  a network device that filters access and traffic coming into a network  software that identifies fast-spreading threats  software on a router that filters traffic based on IP addresses or applications 159. What service is provided by DHCP?  An application that allows real-time chatting among remote users.  Allows remote access to network devices and servers.  Dynamically assigns IP addresses to end and intermediary devices.  Uses encryption to provide secure remote access to network devices and servers. 160. Refer to the exhibit. The switches have a default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for the default gateway. Which network devices will receive the ARP request sent by host A? i360201v3n1_275353.png  only host D  only hosts A, B, C, and D  only hosts B and C  only hosts B, C, and router R1  only hosts A, B, and C  only router R1 164. Which wireless technology has low-power and low-data rate requirements making it popular in IoT environments?  Bluetooth  Zigbee  WiMAX  Wi-Fi Explanation: Zigbee is a specification used for low-data rate, low-power communications. It is intended for applications that require short-range, low data-rates and long battery life. Zigbee is typically used for industrial and Internet of Things (IoT) environments such as wireless light switches and medical device data collection. 165. The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?  The switch will have a management interface with the address 172.16.100.1.  The switch can be remotely managed from a host on another network.  The switch can communicate with other hosts on the 172.16.100.0 network.  The switch is limited to sending and receiving frames to and from the gateway 172.16.100.1. Explanation: A default gateway address is typically configured on all devices to allow them to communicate beyond just their local network.In a switch this is achieved using the command ip defaultgateway .