5. Networking Devices Flashcards
- Which of the following is not a term used when making SOHO Internet connections?
a. Hub
b. Router
c. NIC
d. Switch
e. IDS/IPS
e. Intrusion detection and prevention systems are not a requirement for a SOHO Internet connection.
- 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 recognises 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 of a network together, with one important difference. Whereas a hub sends out everything it receives on one port to all the others, a switch recognises frame boundaries and pays attention to the destination MAC address of the incoming frame as well as the port on which it was received.
- 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 make multiple collision or broadcast domains. Hubs don’t segment a network; they just connect network segments together. Repeaters don’t segment a network; they repeat a signal and allow the distance covered to be increased. So the only correct option is B, a switch.
- What is the primary function of a bridge?
a. Break 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.
- 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 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
b. By allowing full-duplex operation on each port, a switch provides extra bandwidth to each port.
- 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
c. 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.
- 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 addresses to hosts.
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 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 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.
- 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 optimise performance
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.
- 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.
- What is the most common use of 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 block list/blacklist, thus providing content filtering, usually in corporate environments.
- 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 and C aid in boosting network performance. Option B is an advantage gained when segmenting the network. So the only option left is broadcast storms. Increased traffic will increase LAN congestion.
- 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 lease time has not expired.
