Tcp/Ip Lan Check Point
TCP/IP LAN Check Point
#8
Answer: C
Explanation: The network address 150.50.0.0 that was originally assigned is a class B, so it has a default subnet mask of 255.255.0.0. Then you need to divide this network into 7 subnets and only the net work address 255.255.240.0 provides enough networks because it will provide 16 - 2 = 14 subnets (-1 for the network address and -1 for the broadcast address, which gives a -2 from the total of subnets).
#9
Answer: C
Explanation: The network address 209.168.19.0, which was originally assigned is a class C address with a default subnet mask of 255.255.255.0. You then need to divide this address space into four subnets and maximize the number of host addresses per subnet, using 255.255.255.224 would give you 8 - 2 = 6 subnets with each subnet having 32 - 2 = 30 host addresses available. The other answers either do not provide enough subnets and do not provide 30 or more host addresses.
#23.
Answer: A
Explanation: Ping uses ICMP echo packets sent to a host and reports if an echo reply is received or not. If an echo reply is received then the host is properly operating on the network. The other answers are not correct because ARP resolves MAC addresses to IP addresses through the use of broadcasts which are not publicized across the Internet. DNS is used to resolve a domain name to an IP address and does not send communication directly to a network host. WINS would not be supported by most Unix machines and provides Windows computer name resolutions in an enterprise, and is not used on the Internet.
#29
Answer: B
Explanation: Since the network address is a class B address and you need to divide the network address space into three subnets (1 per building) while minimizing waste of IP addresses, the 255.255.255.0 subnet mask is the only answer that provides enough space (254 host addresses) to support the current 175 hosts while also providing more than the 3 subnet requirements. Answer A is incorrect because it is
#8
Answer: C
Explanation: The network address 150.50.0.0 that was originally assigned is a class B, so it has a default subnet mask of 255.255.0.0. Then you need to divide this network into 7 subnets and only the net work address 255.255.240.0 provides enough networks because it will provide 16 - 2 = 14 subnets (-1 for the network address and -1 for the broadcast address, which gives a -2 from the total of subnets).
#9
Answer: C
Explanation: The network address 209.168.19.0, which was originally assigned is a class C address with a default subnet mask of 255.255.255.0. You then need to divide this address space into four subnets and maximize the number of host addresses per subnet, using 255.255.255.224 would give you 8 - 2 = 6 subnets with each subnet having 32 - 2 = 30 host addresses available. The other answers either do not provide enough subnets and do not provide 30 or more host addresses.
#23.
Answer: A
Explanation: Ping uses ICMP echo packets sent to a host and reports if an echo reply is received or not. If an echo reply is received then the host is properly operating on the network. The other answers are not correct because ARP resolves MAC addresses to IP addresses through the use of broadcasts which are not publicized across the Internet. DNS is used to resolve a domain name to an IP address and does not send communication directly to a network host. WINS would not be supported by most Unix machines and provides Windows computer name resolutions in an enterprise, and is not used on the Internet.
#29
Answer: B
Explanation: Since the network address is a class B address and you need to divide the network address space into three subnets (1 per building) while minimizing waste of IP addresses, the 255.255.255.0 subnet mask is the only answer that provides enough space (254 host addresses) to support the current 175 hosts while also providing more than the 3 subnet requirements. Answer A is incorrect because it is