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web.groovymark@gmail.com
- November 19, 2024
Question 01
Which Layer 4 protocol and TWO ports does DHCP use?
a) UDP 53, UDP 67
b) TCP 25, TCP 143
c) UDP 67, UDP 68
d) TCP 80, TCP 443
Correct Answer: c) UDP 67, UDP 68
Explanation: DHCP uses the UDP protocol and operates on ports 67 (server) and 68 (client).
Question 02
Which Layer 4 protocol and port does DNS use for queries?
a) TCP 25
b) UDP 53
c) TCP 443
d) UDP 67
Correct Answer: b) UDP 53
Explanation: DNS uses UDP on port 53 for standard queries, though TCP can also be used for larger transfers like zone transfers.
Question 03
What are the three primary clear text Layer 7 protocols and ports used for email?
a) SMTP TCP 25, POP3 TCP 110, IMAP4 TCP 143
b) HTTP TCP 80, HTTPS TCP 443, FTP TCP 21
c) SSH TCP 22, Telnet TCP 23, DNS UDP 53
d) SNMP UDP 161, NTP UDP 123, LDAP TCP 389
Correct Answer: a) SMTP TCP 25, POP3 TCP 110, IMAP4 TCP 143
Explanation: SMTP, POP3, and IMAP4 are the standard protocols used for sending and receiving email, and they operate on TCP ports 25, 110, and 143, respectively.
Question 04
What are the encrypted and unencrypted port numbers for LDAP?
a) TCP 80, TCP 443
b) TCP 389, TCP 636
c) TCP 110, TCP 25
d) TCP 22, TCP 23
Correct Answer: b) TCP 389, TCP 636
Explanation: LDAP uses port 389 for unencrypted communication and port 636 for encrypted communication.
Question 05
What Layer 4 protocol(s) and ports does SIP use?
a) UDP 67, UDP 68
b) TCP 5060, TCP 5061
c) UDP 53, UDP 123
d) TCP 110, TCP 143
Correct Answer: b) TCP 5060, TCP 5061
Explanation: SIP uses ports 5060 (unencrypted) and 5061 (encrypted) for VoIP and multimedia sessions.
Question 06
What are the 4 core protocols in the TCP/IP suite?
a) HTTP, FTP, DNS, ARP
b) SMTP, DHCP, DNS, ARP
c) TCP, UDP, IP, ICMP
d) TCP, UDP, HTTP, ICMP
Correct Answer: c) TCP, UDP, IP, ICMP
Explanation: The four core protocols of the TCP/IP suite are TCP, UDP, IP, and ICMP, which provide essential communication and error-handling services.
Question 07
What are the 7 OSI layers in order, from top to bottom?
a) Physical, Data Link, Network, Transport, Session, Presentation, Application
b) Application, Presentation, Session, Transport, Network, Data Link, Physical
c) Data Link, Transport, Network, Physical, Session, Application, Presentation
d) Network, Data Link, Physical, Session, Application, Transport, Presentation
Correct Answer: b) Application, Presentation, Session, Transport, Network, Data Link, Physical
Explanation: The OSI model is structured from the Application layer (top) down to the Physical layer (bottom).
Question 08
Which mechanism is controlled by a hub between CSMA/CD and CSMA/CA?
a) CSMA/CD
b) CSMA/CA
c) CSMA/IP
d) CSMA/AD
Correct Answer: a) CSMA/CD
Explanation: CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is used in wired Ethernet networks where hubs control the medium.
Question 09
What defines the boundary of a collision domain?
a) Router
b) Switch port
c) Hub
d) Bridge
Correct Answer: b) Switch port
Explanation: A switch port defines the boundary of a collision domain because switches operate at Layer 2 and segment collision domains.
Question 10
What defines the boundary of a broadcast domain?
a) Switch port
b) Hub
c) Router
d) Repeater
Correct Answer: c) Router
Explanation: Routers separate broadcast domains by not forwarding broadcast traffic between different networks.
Question 11
Which table includes the physical port number between a MAC table and an ARP table?
a) ARP table
b) MAC table
c) Routing table
d) DNS table
Correct Answer: b) MAC table
Explanation: A MAC table contains entries that map MAC addresses to physical port numbers on a switch.
Question 12
Which popular routing protocol is a link-state protocol?
a) RIP
b) EIGRP
c) OSPF
d) BGP
Correct Answer: c) OSPF
Explanation: OSPF (Open Shortest Path First) is a link-state routing protocol used to calculate the shortest path for network traffic.
Question 13
Which popular routing protocol is a hybrid between distance vector and link-state?
a) OSPF
b) RIP
c) EIGRP
d) BGP
Correct Answer: c) EIGRP
Explanation: EIGRP (Enhanced Interior Gateway Routing Protocol) is a hybrid protocol that combines the features of both distance vector and link-state protocols.
Question 14
Which popular routing protocol is an exterior gateway protocol?
a) OSPF
b) RIP
c) EIGRP
d) BGP
Correct Answer: d) BGP
Explanation: BGP (Border Gateway Protocol) is an exterior gateway protocol used to exchange routing information between different autonomous systems.
Question 15
In IPv6, what does a router use to inform a client of the network prefix?
a) Router solicitation
b) Router discovery
c) Router advertisement
d) Neighbor advertisement
Correct Answer: c) Router advertisement
Explanation: In IPv6, routers send Router Advertisement messages to inform clients about the network prefix and other configuration details.
Question 16
Which QoS mechanism embeds traffic priority in an IP header?
a) MPLS
b) Diffserv
c) RSVP
d) Frame Relay
Correct Answer: b) Diffserv
Explanation: Diffserv (Differentiated Services) embeds traffic priority information into the IP header to manage quality of service.
Question 17
What IEEE designation is used for VLAN trunking?
a) 802.1d
b) 802.1x
c) 802.1q
d) 802.11
Correct Answer: c) 802.1q
Explanation: IEEE 802.1q is the standard for VLAN tagging, used for VLAN trunking across network devices.
Question 18
Which two IPv4 address classes do not use a subnet mask?
a) Class A, Class B
b) Class C, Class D
c) Class D, Class E
d) Class A, Class E
Correct Answer: c) Class D, Class E
Explanation: Class D (multicast) and Class E (experimental) addresses do not require subnet masks.
Question 19
In which network topology is every node a repeater?
a) Star
b) Mesh
c) Ring
d) Bus
Correct Answer: c) Ring
Explanation: In a ring topology, each node is a repeater, forwarding data to the next node in the ring.
Question 20
An Ad-hoc wireless network uses which type of network topology?
a) Star
b) Bus
c) Ring
d) Mesh
Correct Answer: d) Mesh
Explanation: Ad-hoc wireless networks typically use a mesh topology, where each device can communicate directly with others.
