A stub network is defined as a network segment that is accessible by only one path (single entry/exit point). It does not serve as a transit network for routing between other networks. Traffic entering or leaving the stub network must pass through a single interface.
MTCNA Course Material – Routing Concepts:
“A stub network is one that is connected to the rest of the network by a single router interface. It has only one entry and one exit point.”
René Meneses MTCNA Study Guide – Routing Terms:
“Stub networks do not forward packets for other networks. They are endpoints with one route in and out.”
Other options:
A/B: Describe transit networks, not stub
C: Misleading—stub has both entry and exit, but only through one path
D:✔Correct definition
Final Answer: DQUESTION NO: 130 [PPP – Protocol Functions]
What PPP protocol provides dynamic addressing, authentication, and multilink?
A. NCP
B. HDLC
C. LCP
D. X.25
Answer: C
LCP (Link Control Protocol) is responsible for establishing, configuring, and testing the data-link connection in PPP. It handles features such as:
Authentication (PAP/CHAP)
Link quality testing
Multilink (combining multiple connections)
Negotiating link options
MTCNA Course Material – PPP Configuration:
“LCP handles link configuration, authentication, multilink, and error detection. NCP handles network layer protocol configuration.”
René Meneses MTCNA Study Guide – PPP Stack:
“LCP is the control protocol used to manage and negotiate the PPP connection, including authentication and multilink.”
Other options:
A: NCP negotiates Layer 3 protocol settings (e.g., IP, IPX)
B: HDLC is a simpler Layer 2 protocol, no support for dynamic addressing or multilink
D: X.25 is a packet-switched WAN protocol, not part of PPP
Final Answer: CQUESTION NO: 131 [Switching – Spanning Tree Protocol (STP)]
In a network with dozens of switches, how many root bridges would you have?
A. 1
B. 2
C. 5
D. 12
Answer: A
Spanning Tree Protocol (STP) is used in Ethernet switching environments to prevent loops. In any STP domain, only one switch is elected as the root bridge. All other switches determine the shortest path to this root bridge and may block redundant paths.
MTCNA Course Material – STP Basics:
“STP ensures a loop-free topology by electing a single root bridge. All path calculations are made from the root bridge’s perspective.”
René Meneses MTCNA Study Guide – STP and Loop Prevention:
“Only one root bridge exists per STP domain. Switches use BPDU messages to elect it based on bridge ID priority.”
No matter how many switches exist (2, 10, or 50), only one root bridge is present at any time.
Final Answer: AQUESTION NO: 132 [IP Addressing – Classful Networking]
Which class of IP address has the most host addresses available by default?
A. A
B. B
C. C
D. A and B
Answer: A
Classful IP addressing reserves different address ranges and host counts:
Class A: 1.0.0.0 – 126.255.255.255 (/8) → 2^24 – 2 = 16,777,214 hosts
Class B: 128.0.0.0 – 191.255.255.255 (/16) → 2^16 – 2 = 65,534 hosts
Class C: 192.0.0.0 – 223.255.255.255 (/24) → 2^8 – 2 = 254 hosts
MTCNA Course Material – IP Address Classes:
“Class A has the largest number of hosts per network, over 16 million. Class B allows around 65,000, and Class C allows 254.”
René Meneses MTCNA Study Guide – Classful IP Summary:
“Class A provides the most host addresses by default due to its /8 subnet.”
Only Class A has the highest host count.
