CompTIA JK0-019 Exam, Valid and updated CompTIA JK0-019 Study Guides 100% Pass With A High Score

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Question No : 41 – (Topic 1)
Which of the following protocols resolves IP addresses to MAC addresses?
A. DNS
B. ARP
C. RARP
D. NTP
Answer: B
Explanation:
ARP is used to convert an IP address to a physical address such as an Ethernet address. ARP has been implemented with many combinations of network and data link layer technologies, such as IPv4, Chaosnet, DECnet and Xerox PARC Universal Packet (PUP) using IEEE 802 standards, FDDI, X.25, Frame Relay and Asynchronous Transfer Mode (ATM). IPv4 over IEEE 802.3 and IEEE 802.11 is the most common case.

Question No : 42 – (Topic 1)
Which of the following port numbers is used for SNMP?
A. 61
B. 151
C. 161
D. 1611
Answer: C

Explanation:
Simple Network Management Protocol (SNMP) is an “Internet-standard protocol for managing devices on IP networks”. Devices that typically support SNMP include routers, switches, servers, workstations, printers, modem racks, UPSes and more. It is used mostly in network management systems to monitor network-attached devices for conditions that warrant administrative attention.

Question No : 43 – (Topic 1)
Which of the following is the definition of a DNS server?
A. Hosts proprietary business applications
B. Translates FQDN’s to IP addresses
C. Provides network IDS/IPS security
D. Assigns IP addresses to network devices
Answer: B

Explanation:
Domain Name System (DNS) is the name resolution protocol for TCP/IP networks, such as the Internet. Client computers query a DNS server to resolve memorable, alphanumeric DNS names to the IP addresses that computers use to communicate with each other.

Question No : 44 – (Topic 1)
Which of the following features can BEST be used to facilitate authorized remote access to a network?
A. VPN concentrator
B. Proxy server
C. Content filter
D. Load balancer
Answer: A

Explanation:
The VPN Concentrator is used for Remote Access VPN’s. In typical use, a Remote Access VPN allows users to use an encrypted tunnel to securely access a corporate or other network via the Internet.

Question No : 45 – (Topic 1)
Which of the following is a Class A IP address?
A. 10.4.0.1
B. 169.254.0.1
C. 192.168.0.1
D. 254.200.0.1
Answer: A
Explanation:
Class A ip address ranges from 10.0.0.0 to 10.255.255.255

Question No : 46 – (Topic 1)
A network where all traffic feeds through a centralized gateway uses which of the following topologies?
A. Peer-to-peer
B. Ring
C. Bus
D. Star
Answer: D

Explanation:
A bus topology is a type of network setup where each computer and network device is connected to a single cable or backbone.

Question No : 47 – (Topic 1)
In order to limit the number of dynamic addresses of hosts on a network, which of the following can be implemented?
A. Scope options
B. Leases
C. Reservations
D. DNS suffixes

Answer: A
Question No : 48 – (Topic 1)
Which of the following IP address/subnet mask combinations represent a broadcast address? (Select TWO).
A. 200.200.100.0/28
B. 200.200.100.32/27
C. 200.200.100.63/27
D. 200.200.100.79/27
E. 200.200.100.95/27
F. 200.200.100.254/30
Answer: C,E
Explanation:
A broadcast address is a logical address at which all devices connected to a multiple-access communications network are enabled to receive datagrams. A message sent to a broadcast address is typically received by all network-attached hosts, rather than by a specific host. ReferencE. http://www.wikihow.com/Calculate-Network-and-Broadcast-Address

Question No : 49 – (Topic 1)
Which of the following networking devices can exist at several layers of the OSI model at the same time? (Select TWO).
A. Switch
B. Cable
C. Repeater
D. Router
E. Bridge
F. Hub
Answer: A,D

Explanation:
A Multilayer Switch and Router work from OSI layer 2, 3 or 4 to IP DSCP (if IP packet) and/or VLAN IEEE 802.1p.

Question No : 50 – (Topic 1)
Which of the following is a path vector routing protocol?
A. RIP
B. EIGRP
C. ISIS
D. OSPF
E. BGP
Answer: E
Explanation:
Because BGP involves a table of IP networks or “prefixes” which designate network reachability among autonomous systems (AS).

Question No : 51 – (Topic 1)
Which of the following routing protocols utilizes the DUAL algorithm for determining best path?
A. EIGRP
B. RIPv2

C. OSPF
D. RIP
Answer: A
Explanation: Diffusing Update Algorithm guarantees loop-free operation and provides a mechanism for fast convergence.

Question No : 52 – (Topic 1)
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
Answer: D,F

Explanation:
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 No : 53 – (Topic 1)
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.

Answer: A
Explanation: 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 No : 54 – (Topic 1)
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.
Answer: D

Explanation:
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 No : 55 – (Topic 1)
The APIPA address 169.254.10.123 falls into which of the following class of addresses?
A. A
B. B
C. C
D. D
Answer: B
Explanation:
As the range for class B is from 128.0.0.0 to 191.255.255.255

Question No : 56 – (Topic 1)
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
Answer: C

Explanation:
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 No : 57 – (Topic 1)
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
Answer: C

Explanation:
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.

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