1,001 CCNA Questions
Sue is having trouble understanding some network concepts and asks you to help identify address types. Which of the following is considered a layer-2 address? (A) 192.168.2.200 (B) www.gleneclarke.com (C) COMPUTER1 (D) 00-AB-0F-2B-3C-4E
00-AB-0F-2B-3C-4E A layer-2 address is the physical address, also known as the MAC address of the system.
You wish to create a crossover cable and have wired one end of the cable with the 568A standard, What standard should you use to wire the opposite end of the cable?
568B To create a crossover cable, you wire one end of the cable with 568A and the other end of the cable with 568B.
Which Gigabit Ethernet standard uses UTP cabling to reach 1000 Mbps? (A) 1000BaseTX (B) 1000BaseSX (C) 1000BaseCX (D) 1000BaseLX
A. 1000BaseTX The Gigabit Ethernet standard that uses UTP cabling is 1000BaseTX
Which of the following is considered a layer-3 address? (A) 192.168.2.200 (B) www.gleneclarke.com (C) COMPUTER1 (D) 00-AB-0F-2B-3C-4E
A. 192.168.2.200 A layer-3 address is a logical address that is assigned to the system. An example of a logical address is an IP address.
Which of the following addresses does a router use to determine where a packet needs to be delivered? (Choose two.) (A) 24.56.78.10 (B) 00-3B-4C-2B-00-AF (C) A layer-3 address (D) A layer-2 address
A. 24.56.78.10 C. A layer-3 address Routers use layer-3 addresses to determine where to send a packet.
Which of the following are considered layer-2 devices? (Choose two.) (A) Bridge (B) Router (C) Repeater (D) Switch (E) Hub
A. Bridge D. Switch Both bridges and switches run at layer 2 and are devices that filter traffic by the MAC address.
What service on the network is responsible for verifying username and passwords when the user attempts to log on?
Authentication server An authentication server is responsible for verifying the username and passwords of clients wishing to access the network
A message that is sent out on the network and is destined for all systems is known as a __________________ message.
Broadcast A broadcast message is a message sent to all systems on the network. A broadcast message has a destination MAC address of FF-FF-FF-FF-FF-FF.
. A group of systems that can receive one another's broadcast messages is known as a __________________.
Broadcast domain A broadcast domain is a group of systems that can receive one another's broadcast message. You can break your network into multiple broadcast domains by using routers or VLANs.
Which 10 Gigabit Ethernet standard uses multimode fiber-optic cabling? (A) 10GBaseLR (B) 10GBaseER (C) 10GBaseSR (D) 1000BaseSX
C. 10GBaseSR The 10 Gbps standard that uses multimode fiber-optic cabling is 10GbaseSR. Remember that the S stands for short range, and multimode fiber-optic cabling is used for short distances.
Which of the following are considered layer-1 devices? (Choose two.) (A) Bridge (B) Router (C) Repeater (D) Switch (E) Hub
C. Repeater E. Hub A hub and a repeater are examples of layer-1 devices. Remember that a layer-1 device works with the electrical signal.
A group of systems that can have their data collide with one another is known as a
Collision domain A collision domain is an area of the network where one system can collide with another system. Each port on a network switch or bridge creates a separate collision domain, whereas all ports on a hub are part of the same collision domain.
You are testing communication to a router and have decided to connect your workstation to the Fast Ethernet port of the router. What type of cable would you use?
Crossover This is a strange question because you typically would not do this, but it is on the exam. In this example, the router and workstation are both "hosts" on the network, so you can consider them similar devices; similar devices are connected with a crossover cable.
You wish to network two systems by connecting a computer directly to another computer. Which type of cable would you use?
Crossover To connect two systems directly together, you use a crossover cable.
You need to create a crossover cable. What wires would you cross on one of the ends? (A) 1 and 2 with 3 and 4 (B) 2 and 4 with 6 and 8 (C) 2 and 4 with 5 and 6 (D) 1 and 2 with 3 and 6
D. 1 and 2 with 3 and 6 In order to create a crossover cable, you would cross wires 1 and 2 with wires 3 and 6 on one of the ends.
Which network service can be configured on your router that is responsible for assigning IP addresses to systems on the network?
DHCP The DHCP service is responsible for assigning IP addresses automatically to systems on the network.
When a client system boots up and requests an IP address, it first must send out which message?
DHCP discover The DHCP discover message is the first message sent out by a DHCP client to locate a DHCP server on the network. The DHCP discover message is a broadcast message which has a destination MAC address of FF-FF-FF-FF-FF-FF.
You are troubleshooting a communication problem. You seem to be able to communicate with Glen's website by IP address, but not by the fully qualified domain name (www.gleneclarke.com). What is most likely the problem?
DNS If you can communicate with a system by the IP address but not the FQDN, it's a classic indication that the name is not able to resolve to an IP address. This is a sign that there is a problem with the DNS
What service on the network is responsible for converting the FQDN to an IP address?
DNS server DNS is responsible for converting the friendly name, such as www.gleneclarke.com, to an IP address.
You are monitoring network traffic and you notice a number of DHCP discover messages on the network. Which of the following is the destination address of the DHCP discover message?
FF-FF-FF-FF-FF-FF The DHCP discover message is a broadcast message which is used to locate the DHCP server on the network. FF-FF-FF-FF-FF-FF is the layer-2 representation of a broadcast address.
A device that can send and receive information, but not at the same time, is said to be _________________.
Half-duplex When a device can send and receive information, but not at the same time, it is known as half-duplex communication. Full duplex is when the device can send and receive at the same time.
Which layer of the OSI model works with frames?
Layer 2 Layer 2 of the OSI model works with frames. This means that devices such as bridges and switches process frames because they are considered layer-2 devices. Note that at layer 3 the data being processed is called a packet because it has a layer-3 header, and at layer 4 the data is known as a segment.
Which layer of the OSI model works with packets?
Layer 3 When the layer-3 header has been added to the message, the message is known as a packet. Layer-3 devices such as routers process packets.
A message that is sent out on the network and is destined for a group of systems is known as a ______________ message.
Multicast Multicast traffic is traffic that is destined for more than one system, but not all systems.
Your manager asks you which service is responsible for translating the source IP address of a packet to the IP address of the public interface on the router.
NAT NAT is responsible for translating the source IP address of a packet to use the IP of the public interface on the NAT device
What layer of the OSI model is responsible for routing and logical addressing?
Network The network layer is responsible for logical addressing and routing.
What is the application layer protocol for receiving e-mail over the Internet?
POP3 POP3 is the Internet protocol for receiving e-mail, whereas SMTP is the Internet protocol for delivering e-mail.
You are troubleshooting communication to a network by looking at the link light on the switch. What layer of the OSI model are you troubleshooting when looking at a link light?
Physical The physical layer of the OSI model deals with physical aspects of the network, such as the cables and connectors. A displayed link light simply means a connection exists.
What device is responsible for regenerating the signal so that the signal can travel a greater distance?
Repeater A repeater is a layer-1 device that is responsible for regenerating the signal.
Name a layer-3 device?
Router A router is an example of a layer-3 device and is responsible for sending or receiving information to and from the network.
What is the application layer protocol for delivering e-mail across the Internet?
SMTP SMTP is the Internet protocol for delivering e-mail, whereas POP3 and IMAP are Internet protocols for receiving e-mail.
You have a UTP cable that has been configured at both ends with the 568B standard. What type of cable is it?
Straight-through A straight-through cable is wired the same at both ends of the cable.
What type of cable would you use if you wanted to connect a system to an RJ-45 port on a switch?
Straight-through Straight-through cables are used to connect dissimilar devices such as a computer to a switch or a router to a switch.
Which device filters traffic by looking at the destination address of the frame and then forwards the frame to the port that the destination system resides on?
Switch A switch is a layer-2 device that filters traffic based off the destination MAC address of the frame.
What layer of the OSI model is responsible for breaking the data into smaller segments?
Transport The transport layer is responsible for breaking the data into smaller chunks called segments.
You are monitoring network traffic and notice that there is a large number of broadcast messages sent across the wire. You would like to separate your network into multiple broadcast domains. How can you do this?
VLANs Router You can use VLANs or a router to break the network into multiple broadcast domains.
