1. A router operates at which OSI layer?
Application
Presentation
Session
Transport
Network
Data Link
Phsical
2. 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
3. What is produced by the deencapsulation of a frame?
Segment
Packet
Data segment
Bits at layer 0
4. What is equivalent to the OSI network layer in the TCP/IP model?
Application
Data link
Internet
Transport
5. 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
6. Disabling SSID broadcast is an effective way to hide the existence of a wireless network from potential hackers.
True
False
7. The logical topology of the Internet is which of the following?
Ring
Bus
Star
Mesh
8. 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
9. To obtain the OSI layer 2 address for a given OSI layer 3 address, which protocol is used?
ARP
RARP
DHCP
ICMP
10. 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
11. The IPv4 address 146.186.157.6 is in which IP class?
A
B
C
D
E
12. Which of the following provides confidentiality for EAP traffic?
LEAP
PEAP
TKIP
WPA2
802.1X
13. A static packet filtering firewall can be configured to drop packets containing a known buffer overflow payload.
True
False
14. 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
15. 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