CompTIA CompTIA Mobility+ N10-005 Questions & Answers

• Question 761:

  Which of the following uses classless subnet masks across a network?

  A. Subnetting

  B. CIDR

  C. Supernetting

  D. Summarization

  Correct Answer: B

  Classless Inter-Domain Routing is based on variable-length subnet masking (VLSM), which allows a network to be divided into variously sized subnets, providing the opportunity to size a network more appropriately for local needs and also CIDR allows an address or routing prefix to be written with a suffix indicating the number of bits of the prefix, such as 192.168.2.0/24.

• Question 762:

  Which of the following uses distance vector algorithms to determine the BEST network route to a destination address?

  A. IS-IS

  B. OSPF

  C. BGP

  D. RIP

  Correct Answer: D

  Here the term distance vector refers to the fact that the protocol manipulates vectors (arrays) of distances to other nodes in the network

• Question 763:

  Which of the following provides secure access to a network device?

  A. SNMPv2

  B. FTP

  C. RSH

  D. SSH

  Correct Answer: D

  Secure Shell (SSH) is a cryptographic network protocol for secure data communication, remote command-line login, remote command execution, and other secure network services between two networked computers that connects, via a secure channel over an insecure network, a server and a client (running SSH server and SSH client programs, respectively).

• Question 764:

  Which of the following is the OSI layer that handles file compression such as LZMA or DEFLATE?

  A. Layer 3

  B. Layer 5

  C. Layer 6

  D. Layer 7

  Correct Answer: C

  The presentation level is translator between the application and network format. Unlike the lower layers, its concern is with the syntax and semantics of the information transmitted. Most user programs do not exchange random binary bit strings. They exchange data such as names, addresses, dates, etc.

  Different computers store the data in a different way. In order to allow these computers to transmit the data to each other the presentation layer translates the data into a standard form to be used on the network. Another function is data compression which can be used to reduce the number of bits needed to send the packet of information. Security is also added at this layer by using data encryption and decryption. This prevents others from intercepting the data and being able to decipher the meaning of the bits.

• Question 765:

  A technician replaces a failed router in an office with the same model unit using the default settings. After the installation, the technician reboots all of the PCs and servers. Upon reboot some of the PCs are receiving IP addresses on the same subnet as the new router; other PCs are receiving addresses on the same subnet as the servers.

  Which of the following most likely describes the issue?

  A. The DHCP lease pool was not large enough

  B. DHCP lease times were set too low

  C. The router is not the only DHCP server

  D. DHCP was not enabled on the replacement router

  Correct Answer: C

  This happens when there are multiple DHCP servers in the same LAN subnet. Here some machines are getting ip address from the router while some are getting ip address from another DHCP server present in the same domain.

• Question 766:

  The APIPA address 169.254.10.123 falls into which of the following class of addresses?

  A. A

  B. B

  C. C

  D. D

  Correct Answer: B

  As the range for class B is from 128.0.0.0 to 191.255.255.255

• Question 767:

  Multiple servers' IP addresses fall within the DHCP scope assigned by the administrator.

  Which of the following should be implemented to ensure these static IP addresses are not assigned to workstations?

  A. The administrator should create exclusions for the workstations IP addresses.

  B. The administrator should change the servers to utilize DHCP to obtain IP addresses.

  C. The administrator should change the workstations to utilize static IP addresses.

  D. The administrator should create exclusions for the servers IP addresses.

  Correct Answer: D

  Whenever you define the ip pool from which IP addresses are to be dynamically assigned to the users then in order to avoid assignment of static ip address we can creat exclusion for the static ip addresses so that they are not assigned to any other host and this is how we can avoid ip address conflict on the network.

• Question 768:

  Which of the following BEST describes the definition of DHCP?

  A. DHCP is utilized to dynamically lease IP addresses to hosts.

  B. DHCP is utilized to statically lease IP address to hosts.

  C. DHCP is utilized to permanently lease IP address dynamically to hosts.

  D. DHCP is utilized to permanently lease IP address statically to hosts.

  Correct Answer: A

  Because DHCP server maintains a database of available IP addresses and configuration information. When the server receives a request from a client, the DHCP server determines the network to which the DHCP client is connected, and then allocates an IP address or prefix that is appropriate for the client, and sends configuration information appropriate for that client

• Question 769:

  The network interface layer of the TCP/IP model corresponds with which of the following layers of the OSI model? (Select TWO).

  A. Transport layer

  B. Network layer

  C. Session layer

  D. Physical layer

  E. Presentation layer

  F. Data link layer

  Correct Answer: DF

  The lowest layer of the OSI Reference Model is the physical layer, which is responsible for the "nitty gritty" details of transmitting information from one place to another on a network. The layer just above the physical layer is the data link layer, called the network interface layer or just the link layer in the TCP/IP architectural model. Its primary job is to implement networks at the local level, and to interface between the hardware-oriented physical layer, and the more abstract, software-oriented functions of the network layer and those above it.

• Question 770:

  Which of the following is a path vector routing protocol?

  A. RIP

  B. EIGRP

  C. ISIS

  D. OSPF

  E. BGP

  Correct Answer: E

  Because BGP involves a table of IP networks or "prefixes" which designate network reachability among autonomous systems (AS).