The TCP/IP or DoD model includes the following layers:
Application
Host-to-Host
Internet
Network Access
The Internet layer in the DoD model is responsible for logical addressing and routing — matching the function of the OSI model's Layer 3 (Network Layer), which handles IP addressing and packet forwarding.
MTCNA Course Material – TCP/IP vs OSI Model:
“The Internet layer of the TCP/IP model maps directly to the OSI’s Network Layer and is responsible for logical addressing and routing.”
René Meneses MTCNA Study Guide – Layer Mapping Table:
“TCP/IP Internet Layer = OSI Network Layer. Handles IP routing, addressing.”
Other mappings:
Application = OSI Layers 5–7
Host-to-Host = OSI Layer 4 (Transport)
Network Access = OSI Layers 1–2
Final Answer: CQUESTION NO: 114 [RouterOS Introduction – ARP]
Which of the following allows a router to respond to an ARP request that is intended for a remote host?
A. Gateway DP
B. Reverse ARP (RARP)
C. Proxy ARP
D. Inverse ARP (IARP)
Answer: C
Proxy ARP allows a router to answer ARP requests on behalf of another device. It is often used in networks where hosts don't have proper default gateways but still need to communicate with devices in different subnets.
MTCNA Course Material – ARP Types:
“Proxy ARP allows a router to respond to an ARP request for an IP address that is not on the local subnet, effectively acting as a proxy.”
René Meneses MTCNA Guide – ARP Configuration:
“Proxy ARP is useful for bridging two IP networks or for clients that do not have default gateways defined.”
MikroTik Wiki – ARP Modes:
“When Proxy ARP is enabled, the router replies to ARP requests for hosts that are not on the same subnet.”
Other options:
A: Gateway DP is not a standard term or protocol.
B: RARP maps MAC to IP — outdated and not used in this context.
D: Inverse ARP is used in Frame Relay, not Ethernet/IP networks.
Final Answer: CQUESTION NO: 115 [DHCP]
You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to accomplish this?
A. SMTP
B. SNMP
C. DHCP
D. ARP
Answer: C
DHCP (Dynamic Host Configuration Protocol) is specifically designed to assign IP configuration details automatically to clients on a network, including:
IP address
Subnet mask
Default gateway
DNS servers
MTCNA Course Material – DHCP Server Function:
“DHCP is a service that dynamically assigns IP settings to clients, removing the need for manual configuration.”
René Meneses MTCNA Study Guide – DHCP Operation:
“DHCP provides automatic configuration of network parameters including IP, mask, DNS, and gateway.”
Other options:
A: SMTP is for email
B: SNMP is for monitoring
D: ARP resolves IP-to-MAC addresses
Final Answer: CQUESTION NO: 116 [DHCP]
Which of the following describe the DHCP Discover message?
It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.
It uses UDP as the Transport layer protocol.
It uses TCP as the Transport layer protocol.
It does not use a layer 2 destination address.
A. 1 only
B. 1 and 2
C. 3 and 4
D. 4 only
Answer: B
When a client sends a DHCP Discover message:
It does not yet have an IP address, so it sends a Layer 2 broadcast (FF:FF:FF:FF:FF:FF).
DHCP uses UDP, not TCP.
Specifically, it uses UDP port 67 (server) and 68 (client).
Layer 2 destination is broadcast — it certainly does use a Layer 2 address.
MTCNA Course Material – DHCP Process:
“The client broadcasts a DHCP Discover message to FF:FF:FF:FF:FF:FF using UDP ports 67 and 68.”
René Meneses MTCNA Study Guide – DHCP Message Types:
“DHCP uses UDP. Discovery messages are Layer 2 broadcasts to locate a DHCP server.”
MikroTik Wiki – DHCP Protocol Behavior:
“The Discover message uses UDP and broadcast MAC addressing.”
Statements:
1: True (Layer 2 broadcast)
2: True (Uses UDP)
3: False (TCP not used)
4: False (Layer 2 destination address is broadcast)
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