F5 101 - Application Delivery Fundamentals
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What is the function of the Application Layer? - CORRECT ANSWER - Allows access to
network services that support applications. Handles network access, flow control and error
recovery. DHCP, DNS, FTP, HTTP, Telnet, SMTP, POP3, SNMP, SSH, IMAP4, NNTP, NTP.
What is the function of the Presentation Layer? - CORRECT ANSWER - Compression,
decompression, encryption and decryption. Translates from application to network format and
vice versa. SSL, WEP, WPA, Kerberos, JPEG, GIF, MPEG, ASCII.
What is the function of the Session Layer? - CORRECT ANSWER - Establish, maintain
and terminate remote sessions. Manages who can transmit data at a certain time and for how
long. NetBIOS, RPC (Remote Procedure Call), Sockets, SQL, Logical ports: 21, 22, 23, 80.
What is the function of the Transport Layer? - CORRECT ANSWER - End-to-end error
recovery, buffering, windowing and flow control between hosts across the network. TCP, UDP,
SPX (Sequenced Packet Exchange - Novell NetWare).
What is the function of the Network Layer? - CORRECT ANSWER - Routing and packet-
switching via logical paths (virtual circuits) for data transmission. Addressing, internetworking,
error handling, congestion control and packet sequencing. IP, IPv4, IPv6, OSPF, ICMP, IGMP,
ARP.
What is the function of the Data Link Layer? - CORRECT ANSWER - Passes frames
between network and physical layers. LLC and MAC sublayers provide data framing, addressing
error detection and handling. 802.11/Wi-Fi, Ethernet, Frame Relay, ATM.
What is the function of the Physical Layer? - CORRECT ANSWER - Transmits raw bit
stream over physical cable. Cables, Hubs, NICs.
,What is the purpose of the various address types found on each layer of the OSI model? -
CORRECT ANSWER - -Application-Datagram
-Presentation-Datagram
-Session-Datagram
-Transport-Segment
-Network-Packet PDU. Packet sequencing, congestion control. IP address routing & switching.
Router, L3 Switch.
-Data Link-Frame. MAC address, assigned to NIC; forward, filter, flood. Switch/Bridge.
-Physical-Bits on wire. Cables, Nics, Hubs.
What is the purpose of the Application layer? - CORRECT ANSWER - It provides the first
step of getting data onto the network. A user/client will initiate the data flow via a software
application (browser, e-mail, file sharing) which sends the data encapsulated down the
framework to be packaged and sent across the network where it's received and de-encapsulated
as it's unpacked up the framework into a readable form presented to the recipient.
At which layer of the OSI Model would you use/find HTTP? - CORRECT ANSWER -
Application
At which layer of the OSI Model would you use/find IP? - CORRECT ANSWER -
Network
At which layer of the OSI Model would you use/find TCP? - CORRECT ANSWER -
Transport
At which layer of the OSI Model would you use/find SSL/TLS? - CORRECT ANSWER -
Presentation
At which layer of the OSI Model would you use/find SSH? - CORRECT ANSWER -
Application
,At which layer of the OSI Model would you use/find ARP? - CORRECT ANSWER -
Network
At which layer of the OSI Model would you use/find Ethernet protocol? - CORRECT
ANSWER - Data Link
At which layer of the OSI Model would you use/find Ethernet cable? - CORRECT
ANSWER - Physical
At which layer of the OSI Model would you use/find Encryption? - CORRECT
ANSWER - Presentation
At which layer of the OSI Model would you use/find a Network Switch? - CORRECT
ANSWER - Data Link
At which layer of the OSI Model would you use/find a Network Hub? - CORRECT
ANSWER - Physical
At which layer of the OSI Model would you use/find UDP? What characteristics describe UDP?
- CORRECT ANSWER - Transport
Uses best effort delivery, connectionless and fast. The main security flaw is susceptibility to
spoofing and DOS attacks.
What layers are in the TCP/IP model and how do they compare to the OSI model? - CORRECT
ANSWER - Application: Application, Presentation, Session
Transport: Transport
Internet: Network
Network Access: Data Link, Physical
Which port is assigned to DNS? - CORRECT ANSWER - 53
, TCP/UDP
Which port is assigned to FTP? - CORRECT ANSWER - 20 (data) 21 (connection)
Which port is assigned to HTTP? HTTPS? - CORRECT ANSWER - 80, 443
Which port is assigned to ICMP/ECHO? - CORRECT ANSWER -7
Which port is assigned to LDAP? - CORRECT ANSWER - 389
Which port is assigned to LDAPS? - CORRECT ANSWER - 636
LDAP over SSL
Which port is assigned to RADIUS Authentication? - CORRECT ANSWER - 1812-1813
Which port is assigned to RDP? - CORRECT ANSWER - 3389
Terminal Server
Which port is assigned to SIP? - CORRECT ANSWER - 5060
Which port is assigned to SMTP? - CORRECT ANSWER - 25
Which port is assigned to SNMP? - CORRECT ANSWER - 161-162
TCP/UDP
Which port is assigned to SSH? - CORRECT ANSWER - 22
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What is the function of the Application Layer? - CORRECT ANSWER - Allows access to
network services that support applications. Handles network access, flow control and error
recovery. DHCP, DNS, FTP, HTTP, Telnet, SMTP, POP3, SNMP, SSH, IMAP4, NNTP, NTP.
What is the function of the Presentation Layer? - CORRECT ANSWER - Compression,
decompression, encryption and decryption. Translates from application to network format and
vice versa. SSL, WEP, WPA, Kerberos, JPEG, GIF, MPEG, ASCII.
What is the function of the Session Layer? - CORRECT ANSWER - Establish, maintain
and terminate remote sessions. Manages who can transmit data at a certain time and for how
long. NetBIOS, RPC (Remote Procedure Call), Sockets, SQL, Logical ports: 21, 22, 23, 80.
What is the function of the Transport Layer? - CORRECT ANSWER - End-to-end error
recovery, buffering, windowing and flow control between hosts across the network. TCP, UDP,
SPX (Sequenced Packet Exchange - Novell NetWare).
What is the function of the Network Layer? - CORRECT ANSWER - Routing and packet-
switching via logical paths (virtual circuits) for data transmission. Addressing, internetworking,
error handling, congestion control and packet sequencing. IP, IPv4, IPv6, OSPF, ICMP, IGMP,
ARP.
What is the function of the Data Link Layer? - CORRECT ANSWER - Passes frames
between network and physical layers. LLC and MAC sublayers provide data framing, addressing
error detection and handling. 802.11/Wi-Fi, Ethernet, Frame Relay, ATM.
What is the function of the Physical Layer? - CORRECT ANSWER - Transmits raw bit
stream over physical cable. Cables, Hubs, NICs.
,What is the purpose of the various address types found on each layer of the OSI model? -
CORRECT ANSWER - -Application-Datagram
-Presentation-Datagram
-Session-Datagram
-Transport-Segment
-Network-Packet PDU. Packet sequencing, congestion control. IP address routing & switching.
Router, L3 Switch.
-Data Link-Frame. MAC address, assigned to NIC; forward, filter, flood. Switch/Bridge.
-Physical-Bits on wire. Cables, Nics, Hubs.
What is the purpose of the Application layer? - CORRECT ANSWER - It provides the first
step of getting data onto the network. A user/client will initiate the data flow via a software
application (browser, e-mail, file sharing) which sends the data encapsulated down the
framework to be packaged and sent across the network where it's received and de-encapsulated
as it's unpacked up the framework into a readable form presented to the recipient.
At which layer of the OSI Model would you use/find HTTP? - CORRECT ANSWER -
Application
At which layer of the OSI Model would you use/find IP? - CORRECT ANSWER -
Network
At which layer of the OSI Model would you use/find TCP? - CORRECT ANSWER -
Transport
At which layer of the OSI Model would you use/find SSL/TLS? - CORRECT ANSWER -
Presentation
At which layer of the OSI Model would you use/find SSH? - CORRECT ANSWER -
Application
,At which layer of the OSI Model would you use/find ARP? - CORRECT ANSWER -
Network
At which layer of the OSI Model would you use/find Ethernet protocol? - CORRECT
ANSWER - Data Link
At which layer of the OSI Model would you use/find Ethernet cable? - CORRECT
ANSWER - Physical
At which layer of the OSI Model would you use/find Encryption? - CORRECT
ANSWER - Presentation
At which layer of the OSI Model would you use/find a Network Switch? - CORRECT
ANSWER - Data Link
At which layer of the OSI Model would you use/find a Network Hub? - CORRECT
ANSWER - Physical
At which layer of the OSI Model would you use/find UDP? What characteristics describe UDP?
- CORRECT ANSWER - Transport
Uses best effort delivery, connectionless and fast. The main security flaw is susceptibility to
spoofing and DOS attacks.
What layers are in the TCP/IP model and how do they compare to the OSI model? - CORRECT
ANSWER - Application: Application, Presentation, Session
Transport: Transport
Internet: Network
Network Access: Data Link, Physical
Which port is assigned to DNS? - CORRECT ANSWER - 53
, TCP/UDP
Which port is assigned to FTP? - CORRECT ANSWER - 20 (data) 21 (connection)
Which port is assigned to HTTP? HTTPS? - CORRECT ANSWER - 80, 443
Which port is assigned to ICMP/ECHO? - CORRECT ANSWER -7
Which port is assigned to LDAP? - CORRECT ANSWER - 389
Which port is assigned to LDAPS? - CORRECT ANSWER - 636
LDAP over SSL
Which port is assigned to RADIUS Authentication? - CORRECT ANSWER - 1812-1813
Which port is assigned to RDP? - CORRECT ANSWER - 3389
Terminal Server
Which port is assigned to SIP? - CORRECT ANSWER - 5060
Which port is assigned to SMTP? - CORRECT ANSWER - 25
Which port is assigned to SNMP? - CORRECT ANSWER - 161-162
TCP/UDP
Which port is assigned to SSH? - CORRECT ANSWER - 22
