D315 network and security foundations
1. Which layer of the OSI layer 2 - datalink
model does a bridge
use to make decisions
about forwarding data
packets?
2. Which protocol pro- Secure shell (SSH) protocol - layer 7 - application layer mainly
vides remote access
over encrypted connec-
tions?
3. What does the ad- It's used to associate a device's IP address with its MAC address, which is
dress resolution proto- needed for a device to send data to another device on the same network
col (ARP) cache map?
4. Which transmission Network layer
control protocol/Inter-
net protocol (TCP/IP)
layer performs address-
ing and routing?
5. How does a Smurf at- It spoofs the source address for all ICMP packets. A Smurf attack at-
tack operate? tempts to spoof the source address of ICMP packets and broadcast to
the network in an attempt to flood it.
6. Which device provides firewalls
web content filtering
and URL scanning?
7. 7 Application Layer Application software, network applications.
Anything you can see with your eyeballs like
web browsers and email.
, D315 network and security foundations
8. Application layer proto- HTTP, FTP, SMIP, IMAP, SMTP
cols
9. 6 Presentation Layer Data conversion utilities. Protocol
Conversion, data translation. Data
encryption/decryption.
10. Presentation layer pro- SSL, ASCII, JPEG, MIDI, MPEG, GIF,
tocols MP3, MP4
11. 5 Session layer Network Operating System. Establishes,
manages & terminates sessions
12. Session layer protocols NFS, SQL, PPTP, NetBIOS, PAP, SCP
(tunneling)
13. 4 Transport Layer Network Operating System. Ensures Error
Free Packets (segments)
14. Transport layer proto- TCP (segments so no missing
cols packets), UDP (datagrams for
streaming like games), SCTP
15. 3 Network Layer Router, Layer 3 switches. Provides routing
decisions. NAT, PAT (packets)
16. Network Layer proto- IP, IPX, IPSec, RIP, IPv4, IPv6, ICMP
cols
17. 2 Data Link Layer Switches, NIC, Token Ring, Frame Relay,
Bridge. Provides for flow of data. NIC
FUNCTIONS at this layer. Bits pass over
physical layer between devices on a LAN
(collision domain). (frames)
, D315 network and security foundations
18. Data Link Layer proto- MAC addresses, ARP, PPP, HDLC,
cols LLC
Communication at MAC-address
level - forwards packets on Layer 2
devices, like a bridge.
19. 1 Physical Layer 802.11, Repeater, Modem, Bluetooth,
Ethernet, hubs, Network Cabling, Wi-Fi.
Signals & Media. (bits)
20. Physical layer protocols DSL, ISDN, physical NICs, twisted
pair cable, fiber. Questions about
"medium" refer to cabling.
21. TCP/IP model layer 4 - OSI Layer 7, 6, 5 = Application, Presentation, Session
Application
22. TCP/IP model layer 3 - OSI Layer 4 = Transport
Transport
23. TCP/IP model layer 2 - OSI Layer 3 = Network
Network
24. TCP/IP model Layer OSI Layers 2 & 1 = Datalink & Physical
1 = Network Inter-
face/Physical
25. Such as which 3 OSI lay- Application, Presentation, Session
ers are in the
TCP/IP Application lay-
er?
26. Contains message, supports network applications.
, D315 network and security foundations
Application layer func-
tion
27. Presentation layer func- Coding, compression, encryption. Protocol Conversion, data translation.
tion
28. Session layer function Aggregates connections for efficiency, synchronization, recovery.
Establishes, maintains, terminates connection.
29. Transport layer function Ensures error-free packets. Transfers & re-sends messages. Re-
sponsible
for breaking up data into segments.
30. Network Layer function Handles routing of datagrams, source to destination. IP addressing
takes
place. Provides routing decisions. NAT, PAT
31. Data Link layer function Aggregates bits to frame and performs data transfer between
neighboring network elements. Physical addressing takes place. Pro-
vides
for flow of data. NIC FUNCTIONS at this layer.
32. Physical Layer function Deals with transmission of bits over copper, fiber, or radio. Physical NICs
33. NIC (Network Interface functions at the data link (layer 2) by using a unique MAC address.
Card)
34. The router is... a network device that is used to connect two or more network segments
by performing OSI layer 3 (Network) functions like packet-forwarding.
And responsible for implementing NAT (network address translation)
35. The file server is... used as a shared storage for all member nodes of a LAN.
36. OSI Layer 4 - Transport
1. Which layer of the OSI layer 2 - datalink
model does a bridge
use to make decisions
about forwarding data
packets?
2. Which protocol pro- Secure shell (SSH) protocol - layer 7 - application layer mainly
vides remote access
over encrypted connec-
tions?
3. What does the ad- It's used to associate a device's IP address with its MAC address, which is
dress resolution proto- needed for a device to send data to another device on the same network
col (ARP) cache map?
4. Which transmission Network layer
control protocol/Inter-
net protocol (TCP/IP)
layer performs address-
ing and routing?
5. How does a Smurf at- It spoofs the source address for all ICMP packets. A Smurf attack at-
tack operate? tempts to spoof the source address of ICMP packets and broadcast to
the network in an attempt to flood it.
6. Which device provides firewalls
web content filtering
and URL scanning?
7. 7 Application Layer Application software, network applications.
Anything you can see with your eyeballs like
web browsers and email.
, D315 network and security foundations
8. Application layer proto- HTTP, FTP, SMIP, IMAP, SMTP
cols
9. 6 Presentation Layer Data conversion utilities. Protocol
Conversion, data translation. Data
encryption/decryption.
10. Presentation layer pro- SSL, ASCII, JPEG, MIDI, MPEG, GIF,
tocols MP3, MP4
11. 5 Session layer Network Operating System. Establishes,
manages & terminates sessions
12. Session layer protocols NFS, SQL, PPTP, NetBIOS, PAP, SCP
(tunneling)
13. 4 Transport Layer Network Operating System. Ensures Error
Free Packets (segments)
14. Transport layer proto- TCP (segments so no missing
cols packets), UDP (datagrams for
streaming like games), SCTP
15. 3 Network Layer Router, Layer 3 switches. Provides routing
decisions. NAT, PAT (packets)
16. Network Layer proto- IP, IPX, IPSec, RIP, IPv4, IPv6, ICMP
cols
17. 2 Data Link Layer Switches, NIC, Token Ring, Frame Relay,
Bridge. Provides for flow of data. NIC
FUNCTIONS at this layer. Bits pass over
physical layer between devices on a LAN
(collision domain). (frames)
, D315 network and security foundations
18. Data Link Layer proto- MAC addresses, ARP, PPP, HDLC,
cols LLC
Communication at MAC-address
level - forwards packets on Layer 2
devices, like a bridge.
19. 1 Physical Layer 802.11, Repeater, Modem, Bluetooth,
Ethernet, hubs, Network Cabling, Wi-Fi.
Signals & Media. (bits)
20. Physical layer protocols DSL, ISDN, physical NICs, twisted
pair cable, fiber. Questions about
"medium" refer to cabling.
21. TCP/IP model layer 4 - OSI Layer 7, 6, 5 = Application, Presentation, Session
Application
22. TCP/IP model layer 3 - OSI Layer 4 = Transport
Transport
23. TCP/IP model layer 2 - OSI Layer 3 = Network
Network
24. TCP/IP model Layer OSI Layers 2 & 1 = Datalink & Physical
1 = Network Inter-
face/Physical
25. Such as which 3 OSI lay- Application, Presentation, Session
ers are in the
TCP/IP Application lay-
er?
26. Contains message, supports network applications.
, D315 network and security foundations
Application layer func-
tion
27. Presentation layer func- Coding, compression, encryption. Protocol Conversion, data translation.
tion
28. Session layer function Aggregates connections for efficiency, synchronization, recovery.
Establishes, maintains, terminates connection.
29. Transport layer function Ensures error-free packets. Transfers & re-sends messages. Re-
sponsible
for breaking up data into segments.
30. Network Layer function Handles routing of datagrams, source to destination. IP addressing
takes
place. Provides routing decisions. NAT, PAT
31. Data Link layer function Aggregates bits to frame and performs data transfer between
neighboring network elements. Physical addressing takes place. Pro-
vides
for flow of data. NIC FUNCTIONS at this layer.
32. Physical Layer function Deals with transmission of bits over copper, fiber, or radio. Physical NICs
33. NIC (Network Interface functions at the data link (layer 2) by using a unique MAC address.
Card)
34. The router is... a network device that is used to connect two or more network segments
by performing OSI layer 3 (Network) functions like packet-forwarding.
And responsible for implementing NAT (network address translation)
35. The file server is... used as a shared storage for all member nodes of a LAN.
36. OSI Layer 4 - Transport
