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What is the length of an IPv6 address?
a. 32 bits
b. 64 bits
c. 128 bits
d. 256 bits
Answer: c. 128 bitssanfoundry+1
Which of the following is not a valid IPv6 addressing type?
a. Unicast
b. Broadcast
c. Multicast
d. Anycast
Answer: b. Broadcastincludehelp+1
How many hexadecimal blocks are there in an IPv6 address?
a. 4
b. 6
c. 8
d. 16
Answer: c. 8testbook+1
What is the primary advantage of IPv6 over IPv4?
a. Shorter addresses
b. Improved routing only
c. Larger address space
d. Compatibility only with old protocols
Answer: c. Larger address spacetestbook+1
Which is used to compress consecutive fields of zeros in IPv6 addresses?
a. Single colon (:)
b. Hyphen (-)
c. Double colon (::)
d. Asterisk (*)
Answer: c. Double colon (::)includehelp+1
How many bits are in each block of an IPv6 address?
a. 4
b. 8
c. 16
d. 32
Answer: c. 16testbook+1
Which field is removed from IPv6 header, compared to IPv4?
a. Source address
b. Header checksum
c. Payload length
d. Version
Answer: b. Header checksumsanfoundry+1
What is the fixed length of IPv6 base header?
a. 20 bytes
b. 40 bytes
c. 60 bytes
d. 100 bytes
Answer: b. 40 bytessanfoundry+1
Which of these is an IPv6 transition strategy?
a. Dual-stack
b. NAT only
c. PPPoE
d. Frame relay
Answer: a. Dual-stacksanfoundry+1
How does IPv6 represent the address 2001:0db8:0000:0000:0000:ff00:0042:8329 in compressed form?
a. 2001:db8:0:0:0:ff00:42:8329
b. 2001:db8::ff00:42:8329
c. 2001::db8::ff00:42:8329
d. 2001:db8:0:ff00:42:8329
Answer: b. 2001:db8::ff00:42:8329includehelp+1
Which of the following address types refers to one-to-many communication in IPv6?
a. Unicast
b. Multicast
c. Anycast
d. Broadcast
Answer: b. Multicastsanfoundry+1
How does IPv6 perform address autoconfiguration?
a. Only manually
b. Through stateful and stateless methods
c. Only with DHCP
d. Only with static IPs
Answer: b. Through stateful and stateless methodstestbook+1
What is the purpose of the Flow Label field in IPv6?
a. Routing classification
b. Quality of Service (QoS) support
c. Checksum calculation
d. NAT
Answer: b. Quality of Service (QoS) supportincludehelp
Which one of the following is not a feature of IPv6?
a. Fragmentation at routers
b. Simplified header
c. Built-in security with IPSec
d. Larger address space
Answer: a. Fragmentation at routerssanfoundry+1
What is the IPv6 loopback address?
a. ::1
b. 127.0.0.1
c. ::0
d. fe80::1
Answer: a. ::1sanfoundry+1
What is the main role of extension headers in IPv6?
a. Simplify address resolution
b. Provide optional information
c. Encrypt all data by default
d. Accelerate routing only
Answer: b. Provide optional informationsanfoundry+1
Which of the following represents a global unicast IPv6 address?
a. fe80::/10
b. ff00::/8
c. 2001:db8::/32
d. ::1
Answer: c. 2001:db8::/32testbook+1
Which IPv6 address type is used for communication within a single subnet only?
a. Global unicast
b. Link-local
c. Multicast
d. Loopback
Answer: b. Link-localincludehelp+1
What is the correct notation for an unspecified IPv6 address?
a. ::
b. ::1
c. ff00::
d. 0::
Answer: a. ::testbook+1
Which prefix denotes IPv6 multicast addresses?
a. 2000::/3
b. fe80::/10
c. ff00::/8
d. ::1/128
Answer: c. ff00::/8includehelp+1
What is the purpose of the Next Header field in IPv6?
a. Indicate upper layer protocol
b. Indicate source
c. Indicate address length
d. Indicate TTL
Answer: a. Indicate upper layer protocolsanfoundry+1
Which protocol is used for neighbor discovery in IPv6?
a. ARP
b. ICMPv6
c. OSPFv3
d. IGMP
Answer: b. ICMPv6sanfoundry+1
Which of the following is not supported in IPv6 by default?
a. Fragmentation by routers
b. Anycast
c. Stateless address autoconfiguration
d. Traffic class field
Answer: a. Fragmentation by routerssanfoundry+1
The IPv6 address prefix for site-local addresses is:
a. fc00::/7
b. fe80::/10
c. fd00::/8
d. ff00::/8
Answer: a. fc00::/7testbook+1
Which is the main benefit of IPv6 over NAT in IPv4?
a. Faster transmission
b. Elimination of address translation
c. Backward compatibility only
d. Smaller header
Answer: b. Elimination of address translationincludehelp+1
What does MTU stand for in IPv6?
a. Minimum Transfer Unit
b. Maximum Transmission Unit
c. Megabit Transfer Unit
d. Modular Transfer Utility
Answer: b. Maximum Transmission Unitsanfoundry+1
In IPv6, which address scope is unique within the link but not routable beyond it?
a. Global unicast
b. Multicast
c. Link-local
d. Site-local
Answer: c. Link-localsanfoundry+1
Which is not a valid representation of an IPv6 address?
a. 2001:db8::2:1
b. ::ffff:192.0.2.128
c. 2001:db8:0:0:0:0:0:1
d. 1234:5678:9abc:def::12345
Answer: d. 1234:5678:9abc:def::12345testbook+1
Which extension header is required for IPv6 fragmentation?
a. Authentication
b. Fragment
c. Routing
d. Hop-by-hop
Answer: b. Fragmentsanfoundry+1
Multicast addresses in IPv6 always begin with what bits?
a. 000
b. 111
c. 10
d. 1111 1111
Answer: d. 1111 1111includehelp+1
In IPv6, what is the default value of the Hop Limit field?
a. 64
b. 128
c. 200
d. 255
Answer: b. 128testbook+1
IPv6 packets are identified by which field in the base header?
a. Traffic Class
b. Next Header
c. Flow Label
d. Source Address
Answer: c. Flow Labelincludehelp+1
Which address type is designed for a single interface on a single device in IPv6?
a. Multicast
b. Link-local
c. Unicast
d. Anycast
Answer: c. Unicastsanfoundry+1
Which statement is true about leading zeros in IPv6 addresses?
a. Required in every segment
b. Prohibited in every segment
c. Should be omitted for simplification
d. Required for even addressing
Answer: c. Should be omitted for simplificationtestbook+1
Can two colons (::) appear more than once in an IPv6 address?
a. Yes, always
b. Only at boundaries
c. Only if address is all zero
d. No, only once
Answer: d. No, only onceincludehelp+1
What is the standard notation for separating IPv6 address fields?
a. Dots
b. Colons
c. Dashes
d. Commas
Answer: b. Colonstestbook+1
Which techniques are used for IPv6 transition?
a. Dual-stack, tunneling, header translation
b. Masking, NAT, DHCP relay
c. Static routing, PPPoE, subnetting
d. IGMP, OSPF, ARP
Answer: a. Dual-stack, tunneling, header translationsanfoundry+1
What does the Next Header value 6 signify in IPv6?
a. UDP
b. TCP
c. ICMPv6
d. OSPFv3
Answer: b. TCPincludehelp+1
Which address is used for IPv6 all-nodes multicast?
a. ff00::1
b. ff02::1
c. fe80::1
d. ff01::1
Answer: b. ff02::1testbook+1
Which extension header must appear first if present in an IPv6 packet?
a. Fragment
b. Routing
c. Hop-by-hop options
d. Authentication
Answer: c. Hop-by-hop optionssanfoundry+1
What does “Stateless address autoconfiguration” in IPv6 mean?
a. Address assigned only manually
b. Host generates its own address without external server
c. Requires NAT device
d. Only router can change the address
Answer: b. Host generates its own address without external serverincludehelp+1
Which is not a valid start for a link-local IPv6 address?
a. fe80
b. fe90
c. fec0
d. fdd0
Answer: d. fdd0testbook+1
Which protocol does IPv6 natively support for security?
a. SSL
b. TLS
c. IPSec
d. WEP
Answer: c. IPSecincludehelp+1
What is the smallest possible IPv6 subnet size (prefix length)?
a. /24
b. /48
c. /64
d. /128
Answer: c. /64testbook+1
Which field in IPv6 header marks the end of extension headers?
a. Payload length
b. Hop limit
c. Next header value
d. Source address
Answer: c. Next header valuesanfoundry+1
What is the hexadecimal value range for an IPv6 segment?
a. 0-15
b. 0-255
c. 0-65535
d. 0-FFFF
Answer: d. 0-FFFFincludehelp+1
Which of the following is not possible in IPv6 address abbreviation?
a. Removing leading zeros
b. Using ‘::’ once to compress
c. Omitting non-zero segments
d. Compressing consecutive zero segments
Answer: c. Omitting non-zero segmentstestbook+1
What mechanism replaces ARP in IPv6?
a. DHCPv6
b. ICMPv6 Neighbor Discovery
c. Address Mapping Table
d. NDAP
Answer: b. ICMPv6 Neighbor Discoverysanfoundry+1
Which of the following is a feature unique to IPv6?
a. NAT
b. Anycast addressing
c. Broadcast domains
d. Header checksum
Answer: b. Anycast addressingsanfoundry+1
What is the size of an IPv6 address in bytes?
a. 8
b. 16
c. 32
d. 64
Answer: b. 16includehelp+1

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