Chapter 5 review questions

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

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

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

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

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

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

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

A. Using appliances 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.

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

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.

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

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 lease time has not expired.

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

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.

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

C. Like a hub, a switch connects multiple segments of a network together, with one important difference. Whereas a hub sends out anything it receives 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 as the port on which it was received.

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.

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.

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

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

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

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.

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

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

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

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

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

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

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

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 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

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.

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

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.

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