Introduction to Networks Final Exam Part 3

66. A network administrator needs to keep the user ID, password, and session contents private when establishing remote CLI connectivity with a switch to manage it. Which access method should be chosen?  Telnet  AUX  SSH  Console 67. What are the two most effective ways to defend against malware? (Choose two.)  Implement a VPN.  Implement network firewalls.  Implement RAID.  Implement strong passwords.  Update the operating system and other application software.  Install and update antivirus software. Explanation: A cybersecurity specialist must be aware of the technologies and measures that are used as countermeasures to protect the organization from threats and vulnerabilities. 68. Which type of security threat would be responsible if a spreadsheet add-on disables the local software firewall?  brute-force attack  Trojan horse  DoS  buffer overflow Explanation: A Trojan horse is software that does something harmful, but is hidden in legitimate software code. A denial of service (DoS) attack results in interruption of network services to users, network devices, or applications. A brute-force attack commonly involves trying to access a network device. A buffer overflow occurs when a program attempts to store more data in a memory location than it can hold. 69. Match the header field with the appropriate layer of the OSI model. (Not all options are used.) 70. Which frame field is created by a source node and used by a destination node to ensure that a transmitted data signal has not been altered by interference, distortion, or signal loss?  User Datagram Protocol field  transport layer error check field  flow control field  frame check sequence field  error correction process field 71. A network administrator is adding a new LAN to a branch ofÏce. The new LAN must support 4 connected devices. What is the smallest network mask that the network administrator can use for the new network?  255.255.255.248  255.255.255.0  255.255.255.128  255.255.255.192 72. What service is provided by POP3?  Retrieves email from the server by downloading the email to the local mail application of the client.  An application that allows real-time chatting among remote users.  Allows remote access to network devices and servers.  Uses encryption to provide secure remote access to network devices and servers. 73. What two security solutions are most likely to be used only in a corporate environment? (Choose two.)  antispyware  virtual private networks  intrusion prevention systems  strong passwords  antivirus software 74. What characteristic describes antivirus software?  applications that protect end devices from becoming infected with malicious software  a network device that filters access and traffic coming into a network  a tunneling protocol that provides remote users with secure access into the network of an organization  software on a router that filters traffic based on IP addresses or applications 75. What mechanism is used by a router to prevent a received IPv4 packet from traveling endlessly on a network?  It checks the value of the TTL field and if it is 0, it discards the packet and sends a Destination Unreachable message to the source host.  It checks the value of the TTL field and if it is 100, it discards the packet and sends a Destination Unreachable message to the source host.  It decrements the value of the TTL field by 1 and if the result is 0, it discards the packet and sends a Time Exceeded message to the source host.  It increments the value of the TTL field by 1 and if the result is 100, it discards the packet and sends a Parameter Problem message to the source host. 76. A client packet is received by a server. The packet has a destination port number of 69. What service is the client requesting?  DNS  DHCP  SMTP  TFTP 77. An administrator defined a local user account with a secret password on router R1 for use with SSH. Which three additional steps are required to configure R1 to accept only encrypted SSH connections? (Choose three.)  Configure DNS on the router.  Generate two-way pre-shared keys.  Configure the IP domain name on the router.  Generate the SSH keys.  Enable inbound vty SSH sessions.  Enable inbound vty Telnet sessions. 78. Which two functions are performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)  places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame  adds Ethernet control information to network protocol data  responsible for internal structure of Ethernet frame  enables IPv4 and IPv6 to utilize the same physical medium  implements trailer with frame check sequence for error detection Other case  integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper  handles communication between upper layer networking software and Ethernet NIC hardware  implements CSMA/CD over legacy shared half-duplex media  applies source and destination MAC addresses to Ethernet frame  applies delimiting of Ethernet frame fields to synchronize communication between nodes 79. An IPv6 enabled device sends a data packet with the destination address of FF02::2. What is the target of this packet?  all IPv6 enabled devices on the local link  all IPv6 DHCP servers  all IPv6 enabled devices across the network  all IPv6 configured routers on the local link 80. What are the three parts of an IPv6 global unicast address? (Choose three.)  subnet ID  subnet mask  broadcast address  global routing prefix  interface ID 81. A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address?  It must send a DHCPv6 INFORMATION-REQUEST message to request the address of the DNS server.  It must send a DHCPv6 REQUEST message to the DHCPv6 server to request permission to use this address.  It must send an ICMPv6 Router Solicitation message to determine what default gateway it should use.  It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network. 82. A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?  Enter CTRL-Z at the privileged mode prompt.  Exit global configuration mode.  Power cycle the device.  Reboot the device.  Exit privileged EXEC mode and press Enter . 83. What method is used to manage contention-based access on a wireless network?  token passing  CSMA/CA  priority ordering  CSMA/CD 84. What is a function of the data link layer?  provides the formatting of data  provides end-to-end delivery of data between hosts  provides delivery of data between two applications  provides for the exchange of frames over a common local media 85. What is the purpose of the TCP sliding window?  to ensure that segments arrive in order at the destination  to end communication when data transmission is complete  to inform a source to retransmit data from a specific point forward  to request that a source decrease the rate at which it transmits data 86. What characteristic describes spyware?  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  the use of stolen credentials to access private data 87. Which switching method drops frames that fail the FCS check?  store-and-forward switching  borderless switching  ingress port buffering  cut-through switching 88. Two pings were issued from a host on a local network. The first ping was issued to the IP address of the default gateway of the host and it failed. The second ping was issued to the IP address of a host outside the local network and it was successful. What is a possible cause for the failed ping?  The default gateway is not operational.  The default gateway device is configured with the wrong IP address.  Security rules are applied to the default gateway device, preventing it from processing ping requests.  The TCP/IP stack on the default gateway is not working properly. 89. What service is provided by FTP?  A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.  An application that allows real-time chatting among remote users.  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. 90. A user is attempting to access http://www.cisco.com/ without success. Which two configuration values must be set on the host to allow this access? (Choose two.)  DNS server  source port number  HTTP server  source MAC address  default gateway 91. Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network? (Choose two.)  NAT adds authentication capability to IPv4.  NAT introduces problems for some applications that require end-to-end connectivity.  NAT will impact negatively on switch performance.  NAT provides a solution to slow down the IPv4 address depletion.  NAT improves packet handling.  NAT causes routing tables to include more information. 92. What subnet mask is needed if an IPv4 network has 40 devices that need IP addresses and address space is not to be wasted?  255.255.255.0  255.255.255.240  255.255.255.128  255.255.255.192  255.255.255.224 93. Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next?  PC2 will send an ARP reply with its MAC address.  RT1 will send an ARP reply with its Fa0/0 MAC address.  RT1 will send an ARP reply with the PC2 MAC address.  SW1 will send an ARP reply with the PC2 MAC address.  SW1 will send an ARP reply with its Fa0/1 MAC address. Explain: When a network device wants to communicate with another device on the same network, it sends a broadcast ARP request. In this case, the request will contain the IP address of PC2. The destination device (PC2) sends an ARP reply with its MAC address. 94. What service is provided by BOOTP?  Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.  Allows for data transfers between a client and a file server.  Legacy application that enables a diskless workstation to discover its own IP address and find a BOOTP server on the network.  A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web. 95. What characteristic describes adware?  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  the use of stolen credentials to access private data  an attack that slows or crashes a device or network service 96. What is a benefit of using cloud computing in networking?  Technology is integrated into every-day appliances allowing them to interconnect with other devices, making them more ‘smart’ or automated.  Network capabilities are extended without requiring investment in new infrastructure, personnel, or software.  End users have the freedom to use personal tools to access information and communicate across a business network.  Home networking uses existing electrical wiring to connect devices to the network wherever there is an electrical outlet, saving the cost of installing data cables. 97. 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. 98. Which information does the show startup-config command display?  the IOS image copied into RAM  the bootstrap program in the ROM  the contents of the current running configuration file in the RAM  the contents of the saved configuration file in the NVRAM Explain: The show startup-config command displays the saved configuration located in NVRAM. The show running-config command displays the contents of the currently running configuration file located in RAM. 99. Refer to the exhibit. What three facts can be determined from the viewable output of the show ip interface brief command? (Choose three.)  Two physical interfaces have been configured.  The switch can be remotely managed.  One device is attached to a physical interface.  Passwords have been configured on the switch.  Two devices are attached to the switch.  The default SVI has been configured. Explain: Vlan1 is the default SVI. Because an SVI has been configured, the switch can be configured and managed remotely. FastEthernet0/0 is showing up and up, so a device is connected. 100. Match each type of frame field to its function. (Not all options are used.) 101. What is the subnet ID associated with the IPv6 address 2001:DA48:FC5:A4:3D1B::1/64?  2001:DA48::/64  2001:DA48:FC5::A4:/64  2001:DA48:FC5:A4::/64  2001::/64 102. Match the firewall function to the type of threat protection it provides to the network. (Not all options are used.)  packet filtering – prevents access based on IP or MAC address  URL filtering – prevents access to websites  network address translator – (none)  stateful packet inspection – prevents unsolicited incoming sessions  application filtering – prevents access by port number Explain:Firewall products come packaged in various forms. These products use different techniques for determining what will be permitted or denied access to a network. They include the following: + Packet filtering – Prevents or allows access based on IP or MAC addresses + Application filtering – Prevents or allows access by specific application types based on port numbers + URL filtering – Prevents or allows access to websites based on specific URLs or keywords + Stateful packet inspection (SPI) – Incoming packets must be legitimate responses to requests from internal hosts. Unsolicited packets are blocked unless permitted specifically. SPI can also include the capability to recognize and filter out specific types of attacks, such as denial of service (DoS) 103. Users are reporting longer delays in authentication and in accessing network resources during certain time periods of the week. What kind of information should network engineers check to find out if this situation is part of a normal network behavior?  syslog records and messages  the network performance baseline  debug output and packet captures  network configuration files 104. What characteristic describes a VPN?