Question 1

Which class of IP address provides a maximum of only 254 host addresses per network ID?

Accepted Answer

Class C network address has only 8 bits for defining hosts : 2 8 - 2 = 256 - 2 = 254

Question 2

The network address of 172.16.0.0/19 provides how many subnets and hosts?

Accepted Answer

A CIDR address of/19 is 255.255.224.0. This is a Class B address, so that is only 3 subnet bits, but it provides 13 host bits, or 8 subnets, each with 8,190 hosts.

Question 3

If a switch has three computers connected to it, with no VLANs present, how many broadcast and collision domains is the switch creating?

Accepted Answer

If a switch has three computersconnected to it, with no VLANs present , one broadcast and three collision domains are created.

Question 4

What must happen if a DHCP IP conflict occurs?

Accepted Answer

If a DHCP Conflict is detected, either by the server sending a ping and getting response or by a host using a gratuitous ARP (arp'ing for its own IP address and seeing if a host responds), then the server will hold that address and not use it again until it is fixed by an administrator.

Question 5

Which OSI layer defines the standards for cabling and connectors?

Accepted Answer

OSI layer 1 defines the standards for cabling and connectors.

Question 6

The network with ip address 192.168.100.0/27 is to be used on a router. If ip subnet-zero is configured, which statement describe the resulting number of available subnets and hosts?

Accepted Answer

Because subnet zero is configured and we have a class C address (192.168.100.0) then the network portion will have 3 bits so 8 subnets will be available. The rest of the bits, 5, represent the available hosts, so 2^5=32, but only 30 are available, 0 ad 31 are network and broadcast respectively.

Question 7

What command will permit SMTP mail to only host 1.1.1.1?

Accepted Answer

when trying to find the best answer to an access - list question, always check the access - list bnumber and then the protocol. When filtering to an upper - layer protocol, you must use an extended list, numbers 100 - 199 and 2000 - 2699. Also, when you filter to the port of an upper - layer protocol, you must use either tcp or udp in the ACL protocol field. If it says ip in the protocol field, you cannot filoter on the port number of an upper - layer protocol. SMTP uses TCP

Question 8

Routers operate at layer _____. LAN switches operate at layer ______. Ethernet hubs operate at layer _____. Word processing operates at layer _______.

Accepted Answer

Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1. Word processing applications communicate to the Application layer interface, but do not operate at layer 7, so the answer would be none.

CISCO Certification Questions