A hub is a simple Layer 1 (Physical Layer) device that does not understand MAC addresses or IP addresses. It simply repeats electrical signals to all connected ports without inspection or filtering.
MTCNA Course Material – OSI Layer Device Roles:
“Hubs operate at the Physical Layer. They do not process frames or packets and function purely as repeaters.”
René Meneses MTCNA Study Guide – OSI Devices:
“Hubs are Layer 1 devices. They send bits — not frames — and have no concept of MAC addresses.”
Other options:
A: Session layer is Layer 5, handles sessions between applications
C: Switches/bridges operate at the Data Link layer (Layer 2)
D: Application layer (Layer 7) is for user-level software like HTTP, FTP, etc.
Final Answer: BQUESTION NO: 138 [Cisco IOS – Access List Verification]
Which command is used to determine if an IP access list is enabled on a particular interface?
A. show access-lists
B. show interface
C. show ip interface
D. show interface access-lists
Answer: C
The command show ip interface displays the status of IP-level interface parameters, including whether an access list (ACL) is applied inbound or outbound.
Cisco IOS Command Reference – Interface ACL Check:
“Use show ip interface to verify whether an access list is applied to the interface and in which direction (in or out).”
René Meneses MTCNA Study Guide – Cisco Access List Monitoring:
“To verify ACL assignment to an interface, use show ip interface. It provides ACL status along with IP addressing info.”
Breakdown:
A: show access-lists → shows ACL contents, not interface bindings
B: show interface → shows interface stats, not ACL usage
D: Invalid syntax in Cisco IOS
Final Answer: CQUESTION NO: 139 [RouterOS Introduction – Transport Protocols]
Which protocol does DHCP use at the Transport layer?
A. IP
B. TCP
C. UDP
D. ARP
Answer: C
DHCP (Dynamic Host Configuration Protocol) operates over UDP:
Client uses UDP port 68
Server uses UDP port 67
It is a connectionless protocol, and because clients typically do not yet have IP addresses, UDP is used due to its simplicity.
MTCNA Course Material – DHCP Protocol Layering:
“DHCP uses UDP for communication between clients and servers. TCP is not used due to the stateless, broadcast nature of DHCP discovery.”
René Meneses MTCNA Study Guide – Port Assignments:
“UDP 67/68 are used by DHCP. TCP is not used because clients lack IPs initially.”
Other options:
A: IP is the network layer, not transport
B: TCP is used by reliable services (FTP, HTTP)
D: ARP resolves IP-to-MAC; unrelated to DHCP transport
Final Answer: CQUESTION NO: 140 [Cisco IOS – Remote Access Configuration]
Which of the following commands will allow you to set your Telnet password on a Cisco router?
A. line telnet 0 4
B. line aux 0 4
C. line vty 0 4
D. line con 0
Answer: C
The correct line configuration for remote Telnet (or SSH) access in Cisco IOS is via the virtual terminal (vty) lines. Typically, Cisco routers reserve 5 lines: vty 0 4. You then apply the password and login commands under this context.
Cisco IOS Configuration Guide – Telnet/VTY Setup:
“Use line vty 0 4 to configure access for Telnet sessions. Then use password and login to enforce authentication.”
René Meneses MTCNA Study Guide – Cisco Access Configuration:
“VTY lines (virtual terminal) handle Telnet and SSH sessions. Console and aux lines are for local access.”
Other options:
A: line telnet is not a valid command
B: line aux → used for modem or auxiliary port access
D: line con 0 → used for console (local) access, not remote
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