At which OSI model layer does a media converter operate?
  • It modulates digital data from the PC into analog data and transmits it on a telephone network.It demodulates analog data from a telephone network into digital PC data.Modem is shorthand for modulator/demodulator. Its job is to convert (or modulate) digital data from a PC into analog telephone signals and transmit them through a telephone network.
  • To prevent hackers from accessing your network.Firewalls prevent unauthorized users from accessing private networks connected to the internet. You should never allow public access to your DHCP server. A proxy server caches web pages. A NAT router or ICS translates Web addresses to private IP addresses. A proxy server and NAT software might be implemented on the same device as your firewall, but they are different concepts.
  • Layer 1A media converter operates at the OSI model layer 1 (Physical layer). The media converter translates frames into bits and transmits them on the transmission medium.At layer 2, the MAC address is added to make the data into a frame. At layer 3, the IP address is added to the packet. A media converter does not alter or use the MAC address or the IP address.
  • SFPGBICOlder network adapters used an external transceiver that matched the media type. While nearly all current network adapters come with a built-in transceiver type, new devices, such as switches and routers, use transceiver modules that allow you to modify the media type of a port by changing the transceiver. Transceiver modules include the following:GBIC (gigabit interface converter) is a larger-sized transceiver that fits in a port slot and is used for Gigabit media including copper and fiber optic.SFP (small form-factor pluggable) is similar to a GBIC but with a smaller size. An SFP is sometimes called a mini-GBICXFP transceiver is similar in size to an SFP but is used for 10 Gigabit networking.
What type of module might a switch use to allow it to modify the media type supported by a switch port? (Select two)OC-xSFPMPLSGBIC
  • SFPGBICOlder network adapters used an external transceiver that matched the media type. While nearly all current network adapters come with a built-in transceiver type, new devices, such as switches and routers, use transceiver modules that allow you to modify the media type of a port by changing the transceiver. Transceiver modules include the following:GBIC (gigabit interface converter) is a larger-sized transceiver that fits in a port slot and is used for Gigabit media including copper and fiber optic.SFP (small form-factor pluggable) is similar to a GBIC but with a smaller size. An SFP is sometimes called a mini-GBICXFP transceiver is similar in size to an SFP but is used for 10 Gigabit networking.
  • Firewall
  • It is typically represented by hexadecimal numbers.It is a 48-bit addressThe MAC address identifies the physical address of the network adapter. The MAC address is a 12-digit (48-bit) hexadecimal number (each number ranges from 0-9 or A-F). The address is often written as 00-B0-D0-06-BC-AC OR 00B0.D006.BCAC, although dashes, periods, and colons can be used to divide the MAC address parts.An IPv4 address is 32-bits and uses octets of decimal numbers between 0-255. An IPv6 address is a 64-bit address that uses 32 hexadecimal numbers.
  • Layer 1A media converter operates at the OSI model layer 1 (Physical layer). The media converter translates frames into bits and transmits them on the transmission medium.At layer 2, the MAC address is added to make the data into a frame. At layer 3, the IP address is added to the packet. A media converter does not alter or use the MAC address or the IP address.
Which of the following is true about the MAC address? (Select two)It is typically represented by octets of decimal numbers between 0-255It is typically represented by hexadecimal numbers.It is a 64-bit addressIt is a 48-bit addressIt is a 32-bit address
  • To prevent hackers from accessing your network.Firewalls prevent unauthorized users from accessing private networks connected to the internet. You should never allow public access to your DHCP server. A proxy server caches web pages. A NAT router or ICS translates Web addresses to private IP addresses. A proxy server and NAT software might be implemented on the same device as your firewall, but they are different concepts.
  • It is typically represented by hexadecimal numbers.It is a 48-bit addressThe MAC address identifies the physical address of the network adapter. The MAC address is a 12-digit (48-bit) hexadecimal number (each number ranges from 0-9 or A-F). The address is often written as 00-B0-D0-06-BC-AC OR 00B0.D006.BCAC, although dashes, periods, and colons can be used to divide the MAC address parts.An IPv4 address is 32-bits and uses octets of decimal numbers between 0-255. An IPv6 address is a 64-bit address that uses 32 hexadecimal numbers.
  • Firewall
  • It modulates digital data from the PC into analog data and transmits it on a telephone network.It demodulates analog data from a telephone network into digital PC data.Modem is shorthand for modulator/demodulator. Its job is to convert (or modulate) digital data from a PC into analog telephone signals and transmit them through a telephone network.
Which of the following statements accurately describes how a modem works? (Select two)
  • Router
  • To prevent hackers from accessing your network.Firewalls prevent unauthorized users from accessing private networks connected to the internet. You should never allow public access to your DHCP server. A proxy server caches web pages. A NAT router or ICS translates Web addresses to private IP addresses. A proxy server and NAT software might be implemented on the same device as your firewall, but they are different concepts.
  • It is typically represented by hexadecimal numbers.It is a 48-bit addressThe MAC address identifies the physical address of the network adapter. The MAC address is a 12-digit (48-bit) hexadecimal number (each number ranges from 0-9 or A-F). The address is often written as 00-B0-D0-06-BC-AC OR 00B0.D006.BCAC, although dashes, periods, and colons can be used to divide the MAC address parts.An IPv4 address is 32-bits and uses octets of decimal numbers between 0-255. An IPv6 address is a 64-bit address that uses 32 hexadecimal numbers.
  • It modulates digital data from the PC into analog data and transmits it on a telephone network.It demodulates analog data from a telephone network into digital PC data.Modem is shorthand for modulator/demodulator. Its job is to convert (or modulate) digital data from a PC into analog telephone signals and transmit them through a telephone network.
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