A network architect is designing a new network and must decide between IPv4 and IPv6. A key consideration is header efficiency and processing overhead. Which statement accurately compares IPv4 and IPv6 headers?

IPv4 headers are fixed at 20 bytes, while IPv6 headers are variable.

Both IPv4 and IPv6 headers include a checksum field for error detection.

IPv6 headers are fixed at 40 bytes and do not include a checksum, reducing router processing overhead.

IPv6 headers are larger and more complex than IPv4 headers, increasing processing overhead.

A network engineer is troubleshooting a connectivity issue where a host on a network with MTU 1500 sends a 2000-byte IP packet to a host on a network with MTU 1400. The router between them has the DF bit set in the packet. What will happen?

The router will drop the packet and send an ICMP Fragmentation Needed message to the source.

The router will fragment the packet into smaller pieces and forward them.

The router will forward the packet unchanged, and the destination will reassemble it.

The router will reduce the TTL and forward the packet without fragmentation.

A network engineer is troubleshooting a performance issue between two hosts separated by a router. The engineer suspects that large packets are being dropped. Which IPv4 header field should the engineer examine to determine whether fragmentation is occurring?

Identification, Flags, and Fragment Offset

Source and Destination IP addresses

Total Length and Header Checksum

How does the IPv6 header differ from the IPv4 header in terms of the checksum?

IPv6 has a larger checksum field.

IPv6 uses a checksum that covers the entire packet.

IPv6 does not include a header checksum.

IPv6 uses the same checksum field as IPv4.

GIAC Certified Intrusion Analyst

Domain 1Objective 1

Concepts of TCP/IP and the Link Layer GCIA Practice Questions (Page 6)

Part of the Network Fundamentals domain, which makes up ~35% of our current practice bank. GIAC (SANS) does not publish an official question count, but from its 240-minute exam (~95–160 total, ~33–56 in this domain), expect 7–11 from this objective — we provide 42 practice questions to prepare you well beyond it. (estimate)

42questions here

9free pages

12concepts

Questions 26–30

26expert · hard
A network architect is designing a new network and must decide between IPv4 and IPv6. A key consideration is header efficiency and processing overhead. Which statement accurately compares IPv4 and IPv6 headers?
Select an answer first
27application · medium
A network engineer is troubleshooting a connectivity issue where a host on a network with MTU 1500 sends a 2000-byte IP packet to a host on a network with MTU 1400. The router between them has the DF bit set in the packet. What will happen?
Select an answer first
28foundation · easy
In an Ethernet frame, which field indicates the type of payload encapsulated in the frame?
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29application · medium
A network engineer is troubleshooting a performance issue between two hosts separated by a router. The engineer suspects that large packets are being dropped. Which IPv4 header field should the engineer examine to determine whether fragmentation is occurring?
Select an answer first
30foundation · easy
How does the IPv6 header differ from the IPv4 header in terms of the checksum?
Select an answer first

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