A router operates at which OSI layer? Application Presentation Session Transport

Question

A router operates at which OSI layer?
   Application
   Presentation
   Session
   Transport
   Network
   Data Link
   Phsical

Suppose application data of size X bytes is transmitted from system A to system B via the OSI layers and that the encapsulation overhead at each layer is exactly 10 bytes. How many bytes will be received by the network layer at system B?
   X bytes
   X+10 bytes
   X+20 bytes
   X+30 bytes
   X+40 bytes
   X+50 bytes
   X+60 bytes

What is produced by the deencapsulation of a frame?
   Segment
   Packet
   Data segment
   Bits at layer 0

What is equivalent to the OSI network layer in the TCP/IP model?
   Application
   Data link
   Internet
   Transport

To connect two nearby wired LANs when you can't easily run cable between them, you would use which of the following wireless infrastructure modes?
   Standalone
   Wired extension
   Enterprise extended
   Bridge

Disabling SSID broadcast is an effective way to hide the existence of a wireless network from potential hackers.
   True
   False

The logical topology of the Internet is which of the following?
   Ring
   Bus
   Star
   Mesh

If you need a wireless data rate of 100 Mbps, which of the following could you use? (Check all that apply.)
   802.11
   802.11a
   802.11b
   802.11g
   802.11n
   802.11ac

To obtain the OSI layer 2 address for a given OSI layer 3 address, which protocol is used?
   ARP
   RARP
   DHCP
   ICMP

The "twist" in a pair of wires inside a twisted pair cable accomplishes which which of the following? (Check all that apply.)
   Reduced crosstalk
   Reduced rates of packet collisions
   Higher bandwidth
   Increased frequency spectrum

The IPv4 address 146.186.157.6 is in which IP class?
   A
   B
   C
   D
   E

Which of the following provides confidentiality for EAP traffic?
   LEAP
   PEAP
   TKIP
   WPA2
   802.1X

A static packet filtering firewall can be configured to drop packets containing a known buffer overflow payload.
   True
   False

Which of the following media access approaches in the event of collision, requires connection stations to wait for a period of time whose duration is of random length before re-attempting transmission?
   CSMA
   CSMA/CA
   CSMA/CD
   Token passing
   Polling

Your web browser has a TCP connection from local port 58088 to remote port 443. The local port is an instance of which of the following?
   A well-known port
   A registered software port
   An ephemeral port
   None of the above

Explanation / Answer

1) The third layer of OSI model Network-Control layer in which the Routers operates.A Router examines the packet data structure determines whether or not to forward it.

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