How many questions are on the SBE CBNE exam?

The CBNE exam has 50 multiple-choice questions; a 70% score is required to pass.

What does the CBNE exam cover?

IP networking fundamentals, switching and routing, media over IP (SMPTE 2110, AES67, PTP), network security, streaming/transport, and IT infrastructure for broadcast.

Who offers the CBNE credential?

The Society of Broadcast Engineers (SBE) offers the Certified Broadcast Networking Engineer (CBNE).

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Sample SBE CBNE Practice Questions

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1In the OSI reference model, at which layer does an IP router primarily make forwarding decisions?

A.Layer 3 (Network)

B.Layer 2 (Data Link)

C.Layer 4 (Transport)

D.Layer 7 (Application)

Explanation: Routers operate at Layer 3, the Network layer, where they forward packets based on destination IP addresses and routing tables. Layer 2 is where switches and MAC addressing operate. The Network layer provides logical addressing and path selection across internetworks.

2Which OSI layer is responsible for converting data into electrical, optical, or radio signals on the physical medium?

A.Layer 1 (Physical)

B.Layer 2 (Data Link)

C.Layer 3 (Network)

D.Layer 5 (Session)

Explanation: The Physical layer (Layer 1) defines the electrical, optical, and mechanical characteristics of transmission, including cabling, connectors, voltage levels, and bit signaling. It transmits raw bits over the medium. Higher layers add framing, addressing, and other structure.

3A host is configured with IP address 192.168.10.50 and subnet mask 255.255.255.192 (/26). What is the network address of its subnet?

A.192.168.10.0

B.192.168.10.32

C.192.168.10.48

D.192.168.10.64

Explanation: A /26 mask creates subnets in blocks of 64 addresses (256-192=64). The subnets are .0, .64, .128, .192. Address .50 falls in the .0-.63 range, so the network address is 192.168.10.0. The broadcast for that subnet is 192.168.10.63.

4How many usable host addresses are available in a /29 IPv4 subnet?

A.8

B.6

C.14

D.2

Explanation: A /29 has 32-29=3 host bits, giving 2^3 = 8 total addresses. Subtracting the network address and broadcast address leaves 8-2 = 6 usable host addresses. A /29 is commonly used for small point-to-multipoint links or device clusters.

5Which of the following IPv4 address ranges is reserved for private use per RFC 1918?

A.172.32.0.0/16

B.192.169.0.0/16

C.10.0.0.0/8

D.169.254.0.0/16

Explanation: RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 for private networks. The 10.0.0.0/8 block provides over 16 million private addresses and is widely used in broadcast facilities. These addresses are not routable on the public internet.

6What is the primary functional difference between TCP and UDP at the transport layer?

A.TCP is connectionless; UDP is connection-oriented

B.TCP operates at Layer 3; UDP operates at Layer 4

C.UDP guarantees delivery while TCP does not

D.TCP provides reliable, ordered delivery with acknowledgments; UDP is connectionless and unreliable

Explanation: TCP is connection-oriented and provides reliable, ordered, acknowledged delivery using sequence numbers and retransmission. UDP is connectionless, has no handshake or retransmission, and adds minimal overhead, making it ideal for low-latency media transport like RTP streams. Both operate at Layer 4.

7Which protocol is used to resolve an IPv4 address to a MAC address on a local Ethernet segment?

A.DNS

B.DHCP

C.ARP

D.ICMP

Explanation: ARP (Address Resolution Protocol) maps a known IPv4 address to its corresponding MAC address on the local link. A host broadcasts an ARP request and the owner of the IP replies with its MAC. This is essential for Layer 2 frame delivery once Layer 3 routing decisions are made.

8An IPv6 address is how many bits in length?

A.32 bits

B.64 bits

C.128 bits

D.256 bits

Explanation: IPv6 addresses are 128 bits long, written as eight groups of four hexadecimal digits. This vastly expands the address space compared to IPv4's 32 bits, eliminating the need for NAT in most cases. The large space supports the scale of modern media and IoT networks.

9In the IPv6 address 2001:0db8:0000:0000:0000:0000:0000:0001, what is the correctly compressed form?

A.2001:db8::1

B.2001:db8:0:1

C.2001::db8::1

D.2001:0db8::0001:1

Explanation: IPv6 compression rules allow leading zeros in each group to be dropped and a single run of consecutive all-zero groups to be replaced with '::'. This yields 2001:db8::1. The double colon may appear only once in an address to avoid ambiguity.

10What is the default subnet mask for a traditional Class C IPv4 network?

A.255.0.0.0

B.255.255.0.0

C.255.255.255.0

D.255.255.255.255

Explanation: A Class C network uses a default mask of 255.255.255.0 (/24), providing 256 addresses with 254 usable hosts. Class A uses /8 and Class B uses /16. Although classful addressing is largely historical, the masks remain common defaults.

About the SBE CBNE Practice Questions

Verified exam format metadata for Certified Broadcast Networking Engineer is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.