Chapter 5 Networking Devices

This device can never run full duplex.

Hub

This device creates on big collision domain and one large broadcast domain.

Hub

A Layer 3 switch or multilayer switch.

Router

This device breaks up collision domains and broadcast domains.

Router

This device can measure the distance to a remote network.

Router

This device sends and receive information about the Network layer.

Router

Logical addressing is used at this layer.

Network

What role does the A record in a Domain Name Service (DNS) server have in your network? A. Translates human name to IP address B. Translates IP address to human name C. Enables printing, copying, and faxing from one device D. Controls network packets to optimize performance

A. DNS translates human names to IP addresses for routing your packets through the internet. Hosts can receive the IP address of this DNS server and then resolve hostnames to IP addresses.

A network device that is used to connect multiple devices together without segmenting a network is a ____. A. Hub B. Wireless access point C. Switch D. Router

A. Hubs create one collision domain and one broadcast domain.

Which of the following is not an advantage of using appliances to offload services like encryption and content filtering? A. Less expensive B. Reduced load on other devices C. Additional functionality D. Better performance

A. Using applications to offload functions such as encryption, content filtering, and VPN concentration can decrease the workload of other systems and add functionality that may be present in these dedicated devices.

What is the most common use for a web proxy? A. Web cache B. Throughput increase C. DHCP services D. Support for user authentication

A. Web cache, of course! Most proxy programs provide a means to deny access to certain URLs in a blacklist, thus providing content filtering, usually in corporate environments.

Which device should be used if you need to send incoming packets to one or more machines that are hidden behind a single IP address? A. Switch B. Load balancer C. Hub D. Repeater

B. A load balancer uses a little trickery and sends incoming packets to one or more machines that are hidden behind a single IP address. Modern load-balancing routers can use different rules to make decisions about where to route traffic, which can be based on least load, fastest response times, or simply balancing requests.

Which of the following devices can work at both Layer 2 and 3 of the OSI model? A. Hub B. Switch C. Multilayer Switch D. Bridge

B. A switch is typically a layer 2 device segmenting the network by using MAC addresses. However, some higher-end switches can provide layer 3 services.

This device uses hardware addresses to filter a network.

Bridge or switchh

Which type of server in your network uses pointer and A records? A. NAT translation server B. IPS/IDS server C. DNS server D. Proxy server

C. A DNS server uses many types of records. An A record is a hostname to IP address record, and a pointer record is an IP address to hostname record.

What advantage does a switch have over a hub? A. It discards frames B. Transmissions received on one port will be sent out all the other ports C. It recognizes frame boundaries and destination MAC addresses of incoming frames D. Any two or more devices the switch connects are capable of causing a collision with each other

C. Like a hub, a switch connects multiple segments to a network together, with one important difference. Whereas a hub sends out anything it receive on one port to all the others, a switch recognizes frame boundaries and pays attention to the destination MAC address of the incoming frame as well at the port on which is was received.

You need a device that can prevent your users from accessing certain websites. Which device should you install? A. Firewall B. IDS C. IPS D. Proxy server

D. A proxy server can be used to prevent external traffic from reaching your internal network directly and can also be used to filter the sites to which your users are allowed to connect.

Users on your network are saturating your bandwidth because they are using too many non-work-related sites. What device would limit the availability of the types of sites that users on a LAN have access to while providing granular control over the traffic between the local LAN and the internet? A. Switch B. DHCP server C. DNS server D. Proxy server

D. A proxy server can provide many functions. A proxy server can use a caching engine so repeated access requests for web information would accelerate repeated access for users, and they can also limit the availability of websites.

Hardware addresses are defined at this layer.

Data link (MAC sublayer)

Ethernet is defined at these layers.

Data link and physical

What is the primary function of a bridge? A. Breaks up collision domains B. Allows a NIC or other networking device to connect to a different type of media than it was designed for C. Allows mobile users to connect to a wired network wirelessly D. None of the above

A. The primary function of a bridge is to keep traffic separated on both sides of it, breaking up collision domains.

Which of the following is among the benefits of a switch? A. Protects LAN resources from attackers on the network B. Provides extra bandwidth C. Reduces throughput D. Allows access to all computers on a LAN

B. By allowing full-duplex operation on each port, a switch provides extra bandwidth to each port.

Users arrive at the office after a weekend and the hosts that were shut down over the weekend are restarted but cannot access the LAN or internet. Hosts that were not shut down are working fine. Where can the problem be? A. The DNS server B. The DHCP server C. The proxy server D. The firewall

B. If the DHCP server has stopped functioning, it will not hand out IP addresses to hosts that are restarted. However, the hosts that were not shut down still have IP addresses because the least time has not expired.

What is a benefit of a multilayer switch (MLS) over a layer 2 switch? A. Less bandwidth B. Routing functions C. Fewer features D. Fewer ports

B. Multilayer switches (also called layer 3 switches) don't have fewer features, less bandwidth, or fewer ports than a normal switch; they just allow routing functions between subnets.

Which device is used to segment a network? A. Hub B. Switch C. Repeater D. All of the above

B. When we say segment, we mean to create multiple collision or broadcast domains. Hubs don't segment a network; they just connect network segments together. Repeaters don't segment the network; they repeat a signal and allow the distance covered to be increased. So the only correct option is B, a switch.

Which of the following is not a term used when making SOHO internet connections? A. Hub B. Router C. NIC D. Switch

C. NICs are the physical network connections for a computer but are not one of the devices or mediums used to provide internet access in a SOHO setting.

Which device does not aid in network segmentation? A. Router B. Switch C. Hub D. Bridge

C. Routers, switches, and bridges are all devices that help break up big networks into a number of smaller ones - also known as network segmentation. Hubs don't segment networks - they just connect network segments together.

Which device creates separate collision domains and a single broadcast domain? A. Hub B. Router C. Switch D. Modem

C. Switches create separate collision domains but a single broadcast domain. Remember that routers provide a separate broadcast domain for each interface.

Which is not an advantage of network segmentation? A. Reducing congestion B. Improving security C. Containing network problems D. Preventing broadcast storms

D. Options A, B, and C all aid in boosting network performance, so the only option left is broadcast storms. Increased traffic will increase LAN congestion.

What is an advantage of using DHCP in a network environment? A. More difficult administration of the network B. Static IP addressing C. Can send an operating system for the PC to boot from D. Assigns IP address to hosts

D. Remember that DHCP servers assign IP address to hosts. Thus, DHCP allows easier administration than providing IP information to each host by hand (called static IP addressing).

This device creates many smaller collision domains, but the network is still one large broadcast domain.

Switch or bridge

This layer creates a virtual circuit before transmitting between two end stations.

Transport

This layer supports flow control and sequencing.

Transport