Introduction to Networks Final Exam Part 4

 software on a router that filters traffic based on IP addresses or applications  software that identifies fast-spreading threats  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 105. Which two statements are correct in a comparison of IPv4 and IPv6 packet headers? (Choose two.)  The Source Address field name from IPv4 is kept in IPv6.  The Version field from IPv4 is not kept in IPv6.  The Destination Address field is new in IPv6.  The Header Checksum field name from IPv4 is kept in IPv6.  The Time-to-Live field from IPv4 has been replaced by the Hop Limit field in IPv6. 106. A network administrator wants to have the same network mask for all networks at a particular small site. The site has the following networks and number of devices: IP phones – 22 addresses PCs – 20 addresses needed Printers – 2 addresses needed Scanners – 2 addresses needed The network administrator has deemed that 192.168.10.0/24 is to be the network used at this site. Which single subnet mask would make the most efficient use of the available addresses to use for the four subnetworks?  255.255.255.192  255.255.255.252  255.255.255.240  255.255.255.248  255.255.255.0  255.255.255.224 107. What is an advantage to using a protocol that is defined by an open standard?  A company can monopolize the market.  The protocol can only be run on equipment from a specific vendor.  An open standard protocol is not controlled or regulated by standards organizations.  It encourages competition and promotes choices. Explain: A monopoly by one company is not a good idea from a user point of view. If a protocol can only be run on one brand, it makes it difficult to have mixed equipment in a network. A proprietary protocol is not free to use. An open standard protocol will in general be implemented by a wide range of vendors. 108. A network administrator is adding a new LAN to a branch ofÏce. The new LAN must support 200 connected devices. What is the smallest network mask that the network administrator can use for the new network?  255.255.255.240  255.255.255.0  255.255.255.248  255.255.255.224 109. What are three commonly followed standards for constructing and installing cabling? (Choose three.)  cost per meter (foot)  cable lengths  connector color  pinouts  connector types  tensile strength of plastic insulator 110. Refer to the exhibit. What is wrong with the displayed termination?  The woven copper braid should not have been removed.  The wrong type of connector is being used.  The untwisted length of each wire is too long.  The wires are too thick for the connector that is used. Explanation: When a cable to an RJ-45 connector is terminated, it is important to ensure that the untwisted wires are not too long and that the flexible plastic sheath surrounding the wires is crimped down and not the bare wires. None of the colored wires should be visible from the bottom of the jack. 111. Match the characteristic to the category. (Not all options are used.) 112. A client packet is received by a server. The packet has a destination port number of 143. What service is the client requesting?  IMAP  FTP  SSH  Telnet 113. What are two characteristics shared by TCP and UDP? (Choose two.)  default window size  connectionless communication  port numbering  3-way handshake  ability to to carry digitized voice  use of checksum Explain: Both TCP and UDP use source and destination port numbers to distinguish different data streams and to forward the right data segments to the right applications. Error checking the header and data is done by both protocols by using a checksum calculation to determine the integrity of the data that is received. TCP is connection-oriented and uses a 3-way handshake to establish an initial connection. TCP also uses window to regulate the amount of traffic sent before receiving an acknowledgment. UDP is connectionless and is the best protocol for carry digitized VoIP signals. 114. Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?  Header Length  Differentiated Services  Time-to-Live  Fragment Offset Explanation: When a router receives a packet, the router will decrement the Time-to-Live (TTL) field by one. When the field reaches zero, the receiving router will discard the packet and will send an ICMP Time Exceeded message to the sender. 115. A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?  FTP  LDAP  SLP  SNMP 116. What attribute of a NIC would place it at the data link layer of the OSI model?  attached Ethernet cable  IP address  MAC address  RJ-45 port  TCP/IP protocol stack 117. A network administrator is adding a new LAN to a branch ofÏce. The new LAN must support 10 connected devices. What is the smallest network mask that the network administrator can use for the new network?  255.255.255.192  255.255.255.248  255.255.255.224  255.255.255.240 118. A user is executing a tracert to a remote device. At what point would a router, which is in the path to the destination device, stop forwarding the packet?  when the router receives an ICMP Time Exceeded message  when the RTT value reaches zero  when the host responds with an ICMP Echo Reply message  when the value in the TTL field reaches zero  when the values of both the Echo Request and Echo Reply messages reach zero Explain: When a router receives a traceroute packet, the value in the TTL field is decremented by 1. When the value in the field reaches zero, the receiving router will not forward the packet, and will send an ICMP Time Exceeded message back to the source. 119. Refer to the exhibit. The network administrator has assigned the LAN of LBMISS an address range of 192.168.10.0. This address range has been subnetted using a /29 prefix. In order to accommodate a new building, the technician has decided to use the fifth subnet for configuring the new network (subnet zero is the first subnet). By company policies, the router interface is always assigned the first usable host address and the workgroup server is given the last usable host address. Which configuration should be entered into the properties of the workgroup server to allow connectivity to the Internet?  IP address: 192.168.10.65 subnet mask: 255.255.255.240, default gateway: 192.168.10.76  IP address: 192.168.10.38 subnet mask: 255.255.255.240, default gateway: 192.168.10.33  IP address: 192.168.10.38 subnet mask: 255.255.255.248, default gateway: 192.168.10.33  IP address: 192.168.10.41 subnet mask: 255.255.255.248, default gateway: 192.168.10.46  IP address: 192.168.10.254 subnet mask: 255.255.255.0, default gateway: 192.168.10.1 Explain: Using a /29 prefix to subnet 192.168.10.0 results in subnets that increment by 8: 192.168.10.0 (1) 192.168.10.8 (2) 192.168.10.16 (3) 192.168.10.24 (4) 192.168.10.32 (5) 120. Refer to the exhibit. The switches are in their default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for its default gateway. Which network hosts will receive the ARP request sent by host A?  only host D  only router R1  only hosts A, B, and C  only hosts A, B, C, and D  only hosts B and C  only hosts B, C, and router R1 Explain: Since host A does not have the MAC address of the default gateway in its ARP table, host A sends an ARP broadcast. The ARP broadcast would be sent to every device on the local network. Hosts B, C, and router R1 would receive the broadcast. Router R1 would not forward the message. 121. Which two trafÏc types use the Real-Time Transport Protocol (RTP)? (Choose two.)  video  web  file transfer  voice  peer to peer 122. Which wireless technology has low-power and data rate requirements making it popular in home automation applications?  ZigBee  LoRaWAN  5G  Wi-Fi 123. Which layer of the TCP/IP model provides a route to forward messages through an internetwork?  application  network access  internet  transport Explain: The OSI model network layer corresponds directly to the internet layer of the TCP/IP model and is used to describe protocols that address and route messages through an internetwork. 124. Which type of server relies on record types such as A, NS, AAAA, and MX in order to provide services?  DNS  email  file  web Explain: A DNS server stores records that are used to resolve IP addresses to host names. Some DNS record types include the following: A – an end device IPv4 address NS – an authoritative name server AAAA – an end device IPv6 address MX – a mail exchange record 125. What are proprietary protocols?  protocols developed by private organizations to operate on any vendor hardware  protocols that can be freely used by any organization or vendor  protocols developed by organizations who have control over their definition and operation  a collection of protocols known as the TCP/IP protocol suite Explain: Proprietary protocols have their definition and operation controlled by one company or vendor. Some of them can be used by different organizations with permission from the owner. The TCP/IP protocol suite is an open standard, not a proprietary protocol. 126. What service is provided by DNS?  Resolves domain names, such as cisco.com, into IP addresses.  A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.  Allows for data transfers between a client and a file server.  Uses encryption to secure the exchange of text, graphic images, sound, and video on the web. 127. A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?  DNS  DHCP  SMTP  POP3 128. What command can be used on a Windows PC to see the IP configuration of that computer?  show ip interface brief  ping  show interfaces  ipconfig 129. A wired laser printer is attached to a home computer. That printer has been shared so that other computers on the home network can also use the printer. What networking model is in use?  client-based  master-slave  point-to-point  peer-to-peer (P2P) Explanation: Peer-to-peer (P2P) networks have two or more network devices that can share resources such as printers or files without having a dedicated server. 130. What characteristic describes a virus?  a network device that filters access and traffic coming into a network  the use of stolen credentials to access private data  an attack that slows or crashes a device or network service  malicious software or code running on an end device 131. Three bank employees are using the corporate network. The first employee uses a web browser to view a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other corporate managers in branch ofÏces. If QoS is implemented on this network, what will be the priorities from highest to lowest of the different data types?  financial transactions, web page, audio conference  audio conference, financial transactions, web page  financial transactions, audio conference, web page  audio conference, web page, financial transactions Explanation: QoS mechanisms enable the establishment of queue management strategies that enforce priorities for different categories of application data. Thus, this queuing enables voice data to have priority over transaction data, which has priority over web data. 132. Match the description to the IPv6 addressing component. (Not all options are used.) 133. Refer to the exhibit. If Host1 were to transfer a file to the server, what layers of the TCP/IP model would be used?  only application and Internet layers  only Internet and network access layers  only application, Internet, and network access layers  application, transport, Internet, and network access layers  only application, transport, network, data link, and physical layers  application, session, transport, network, data link, and physical layers Explanation: The TCP/IP model contains the application, transport, internet, and network access layers. A file transfer uses the FTP application layer protocol. The data would move from the application layer through all of the layers of the model and across the network to the file server. 134. Match the characteristic to the forwarding method. (Not all options are used.) Explanation: A store-and-forward switch always stores the entire frame before forwarding, and checks its CRC and frame length. A cut-through switch can forward frames before receiving the destination address field, thus presenting less latency than a store-and-forward switch. Because the frame can begin to be forwarded before it is completely received, the switch may transmit a corrupt or runt frame. All forwarding methods require a Layer 2 switch to forward broadcast frames. 135. Refer to the exhibit. The IP address of which device interface should be used as the default gateway setting of host H1?  R1: S0/0/0  R2: S0/0/1  R1: G0/0  R2: S0/0/0 136. What service is provided by Internet Messenger?  An application that allows real-time chatting among remote users.  Allows remote access to network devices and servers.  Resolves domain names, such as cisco.com, into IP addresses.  Uses encryption to provide secure remote access to network devices and servers. 137. 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. Explanation: Network A needs to use 192.168.0.128 /25, which yields 128 host addresses. Network B needs to use 192.168.0.0 /26, which yields 64 host addresses. Network C needs to use 192.168.0.96 /27, which yields 32 host addresses. Network D needs to use 192.168.0.80/30, which yields 4 host addresses.