IT Essentials Chapter 5 Study Guide
What is the correct order of the layers of the TCP/IP model from the top layer to the bottom?
application • transport • internet • network access
When would a printer be considered a network host?
when it is connected to a switch
Bridge
A bridge serves the same purpose. It connects two or more local area networks (LANs) together, has a single input and single output port
Hub
Connects multiple wires coming from different branches, cannot filter data
A client packet is received by a server. The packet has a destination port number of 53. What service application is the client requesting?
DNS
A user needs to access the Internet from home. Which device is needed if a user connects to an ISP through the telephone network?
DSL modem
A client packet is received by a server. The packet has a destination port number of 137. What service application is the client requesting?
NetBIOS (NetBT)
Which two types of signal interference are reduced more by STP than by UTP?
RFI • EMI
A client packet is received by a server. The packet has a destination port number of 161. What service application is the client requesting?
SNMP
A client packet is received by a server. The packet has a destination port number of 22. What service application is the client requesting?
SSH
Which device provides wireless connectivity to users as its primary function?
access point
Which two devices are commonly powered by PoE?
access point • IP phone
Which well-known port number is used by the DHCP (client) protocol?
68
How many devices can a bluetooth device connect to simultaneously?
7
Which IEEE standard operates at wireless frequencies in both the 5 GHz and 2.4 GHz ranges?
802.11n
Repeater
A device that picks up signals from lower-power radio units, such as mobile and portable radios, and retransmits them at a higher power. It allows low-power radio signals to be transmitted over longer distances.
Network protocols
Established set of rules that determine how data is transmitted between different devices in the same network - TCP/IP, DNS, DHCP
A client packet is received by a server. The packet has a destination port number of 21. What service application is the client requesting?
FTP
Ways to secure a network
Firewall protection - blocks unauthorized access to computers and networks Password protection - update passwords at least every quarter. Enforce password rules so that passwords are difficult to guess. Antivirus - keep your anti-virus regularly updated. Vpn - more secure connection between remote computers and other, "local," computers and servers.
A client packet is received by a server. The packet has a destination port number of 143. What service application is the client requesting?
IMAP
A technician is searching through a storage locker and finds a cable modem. What is the purpose of this device?
It connects a home or business network to a company that provides internet connectivity as well as television signals.
A technician is searching through a storage locker and finds a managed switch. What is the purpose of this device?
It connects multiple end devices and can be configured for VLANs and port security.
What is a characteristic of a WAN?
It connects multiple networks that are geographically separated.
A technician is searching through a storage locker and finds a DSL modem. What is the purpose of this device?
It connects the network of a user to the digital infrastructure of a phone company, providing always-on service.
A technician is searching through a storage locker and finds a PoE injector. What is the purpose of this device?
It is a device that can be inserted in the middle of a cable run to add power.
A technician is searching through a storage locker and finds a Powerline networking connector. What is the purpose of this device?
It is a device that uses existing electrical wiring to connect devices and sends data using specific frequencies.
A technician is searching through a storage locker and finds an unmanaged switch. What is the purpose of this device?
It is a device whose sole purpose is to connect end devices and to microsegment a LAN.
A technician is searching through a storage locker and finds an access point. What is the purpose of this device?
It uses radio waves to provide network access to wireless devices.
A client packet is received by a server. The packet has a destination port number of 389. What service application is the client requesting?
LDAP
Difference between Osi and TCP/IP
OSI refers to Open Systems Interconnection whereas TCP/IP refers to Transmission Control Protocol. OSI follows a vertical approach whereas TCP/IP follows a horizontal approach.
A client packet is received by a server. The packet has a destination port number of 25. What service application is the client requesting?
SMTP
A client packet is received by a server. The packet has a destination port number of 23. What service application is the client requesting?
Telnet
Which network device would be the most appropriate to provide stateful packet filtering, email filtering, and VPN services?
UTM
Virtual ports
Virtual ports are used in TCP and UDP to identify unique end-to-end connections.
Which smart home wireless technology has an open standard that allows up to 232 devices to be connected?
Z-Wave
Which technology is most often used to connect devices to a PAN?
bluetooth
Which network device allows administrators to remotely manage many devices through one dashboard interface?
cloud-based network controller
Which type of server would support the SMTP, POP, and IMAP protocols?
Which type of connection to the Internet is capable of the fastest transfer rates?
fiber
A network specialist has been hired to install a network in a company that assembles airplane engines. Because of the nature of the business, the area is highly affected by electromagnetic interference. Which type of network media should be recommended so that the data communication will not be affected by EMI?
fiber optic
Which pairs of wires change termination order between the 568A and 568B standards?
green and orange
Which internet connection type is an always-on service that uses radio signals sent from a tower to a receiver in a home or business? line of sight wireless
line of sight wireless
Which network device makes forwarding decisions based on the destination MAC address that is contained in the frame?
switch
A customer is considering a multipurpose device to create a home network. which three devices are usually integrated into a multipurpose network device?
switch • router • wireless access point
Which type of server would be used to keep a historical record of messages from monitored network devices?
syslog
A technician with a PC is using multiple applications while connected to the Internet. how is the PC able to keep track of the data flow between multiple application sessions and have each application receive the correct packet flows?
the data flow is being tracked based on the source port number that is used by each application.
What is a common function of a proxy server?
to store frequently accessed web pages on the internal network
