MikroTik MTCIPv6E Practice Exam

• A. /interface ipv6
• B. /ipv6 address Correct answer
• C. /ip address
• D. /system ipv6

Option B is correct because in MikroTik RouterOS, IPv6 addresses are managed under the /ipv6 address menu, which is separate from the /ip address menu used for IPv4. Options B, C, and D refer to menus that either handle IPv4 addresses or do not exist in RouterOS.

• A. Multicast
• B. Unique local
• C. Link-local Correct answer
• D. Global unicast

Option C is correct because the prefix fe80::/10 is reserved for IPv6 link-local addresses, which are automatically assigned to every IPv6-enabled interface and are only valid on the local network segment. Global unicast uses 2000::/3, unique local uses fc00::/7, and multicast uses ff00::/8.

• A. True Correct answer
• B. False

IPv6 addresses are indeed 128 bits long, compared to IPv4's 32 bits. Since 128 / 32 = 4, IPv6 addresses are exactly four times the length of IPv4 addresses, providing a vastly larger address space of approximately 3.4 × 10^38 unique addresses.

• A. 2001:db8:abce:1::/64
• B. 2001:db8:abcd:1::/64
• C. 2001:db8:abcd:1::/63
• D. 2001:db8:abcd:3::/64 Correct answer

Option D, 2001:db8:abcd:3::/64, is correct because the topology shows R1's delegated /48 already split into LAN-A (2001:db8:abcd:1::/64) and LAN-B (2001:db8:abcd:2::/64), so the next unused /64 within that /48 is the one using subnet 3. Option B duplicates LAN-A's subnet and option A falls outside the delegated /48 entirely, so neither is usable.

• A. /ipv6 address add address=2001:db8::1/64 interface=ether1 Correct answer
• B. /ipv6 route add address=2001:db8::1/64 interface=ether1
• C. /interface ipv6 set address=2001:db8::1/64 ether1
• D. /ip address add address=2001:db8::1/64 interface=ether1

Option A is correct because /ipv6 address add address=2001:db8::1/64 interface=ether1 is the proper RouterOS command to assign a static IPv6 address. IPv6 addresses are managed under the /ipv6 address menu, separate from /ip address used for IPv4.

• A. The host can communicate with 64 other devices
• B. The address is 64 bits long
• C. The address has 64 available subnets
• D. The first 64 bits identify the network portion Correct answer

Option D is correct because the /64 prefix length means the first 64 bits of the address identify the network portion, and the remaining 64 bits identify the host (interface identifier). This is the standard boundary for IPv6 subnets.

• A. True Correct answer
• B. False

When advertise=yes is set on an IPv6 address in RouterOS, the prefix of that address is automatically included in Router Advertisement messages sent from that interface. Hosts on the link use these advertised prefixes for SLAAC or to learn the on-link prefix information.

• A. fe80::21c:42ff:fe4a:1b2c (reachable)
• B. fe80::c0ff:eeff:fe12:3456 (failed)
• C. fe80::5054:ff:fe12:9999 (reachable)
• D. fe80::a8bb:ccff:fedd:eeff (stale) Correct answer

Option D, fe80::a8bb:ccff:fedd:eeff (stale), is correct because the STALE state is exactly the one where an entry is still used to forward traffic while RouterOS revalidates it with Neighbor Discovery in the background; the output's other entries are already REACHABLE (confirmed, not being revalidated) or FAILED (not usable for forwarding at all).

• A. 20 bytes
• B. 40 bytes Correct answer
• C. 60 bytes
• D. Variable length

Option B is correct because the IPv6 base header is always 40 bytes (320 bits). Unlike IPv4's variable-length header, IPv6 moved optional features into extension headers, keeping the base header fixed for faster processing.

• A. 1280 bytes Correct answer
• B. 1500 bytes
• C. 576 bytes
• D. 9000 bytes

Option A is correct because RFC 8200 mandates that every IPv6 link must support a minimum MTU of 1280 bytes. This is significantly larger than IPv4's minimum of 68 bytes, ensuring that IPv6 packets can carry meaningful payloads without fragmentation.

• A. Flow Label Correct answer
• B. The fixed 40-byte header length with no IHL field Correct answer
• C. Hop Limit
• D. Traffic Class

Options A and B are correct because the Flow Label (20 bits for identifying traffic flows) is entirely new in IPv6 with no IPv4 equivalent. Additionally, IPv6's fixed 40-byte header eliminates the need for the IHL (Internet Header Length) field that IPv4 requires to indicate variable header sizes. Hop Limit has an equivalent in IPv4's TTL, and Traffic Class corresponds to IPv4's Type of Service/DSCP field.

• A. True Correct answer
• B. False

The IPv6 base header is a fixed 40 bytes (320 bits), compared to the IPv4 minimum header size of 20 bytes (without options). Despite being twice as large, the IPv6 header is simpler with fewer fields, because rarely-used fields were moved to optional extension headers, and the checksum was removed to improve forwarding performance.

• A. 89
• B. 6
• C. 1
• D. 58 Correct answer

Option D is correct because ICMPv6 is identified by Next Header value 58 in the IPv6 header. For comparison, value 1 is ICMPv4, value 6 is TCP, and value 89 is OSPF.

• A. Destination Unreachable (Type 1) Correct answer
• B. Time Exceeded (Type 3) Correct answer
• C. Echo Request (Type 128)
• D. Router Solicitation (Type 133)

Options A and B are correct because ICMPv6 messages are divided into error messages (Types 1-127) and informational messages (Types 128-255). Destination Unreachable (Type 1) and Time Exceeded (Type 3) are error messages. Echo Request (Type 128) and Router Solicitation (Type 133) are informational messages. Other error types include Packet Too Big (Type 2) and Parameter Problem (Type 4).

• A. Using two separate physical network interfaces for IPv4 and IPv6
• B. Running both IPv4 and IPv6 simultaneously on the same device Correct answer
• C. Encapsulating IPv6 packets inside IPv4 headers
• D. Translating IPv4 packets into IPv6 packets at the gateway

Option B is correct because dual stack is the IPv6 transition strategy where a device runs both IPv4 and IPv6 protocol stacks simultaneously on the same interfaces. This allows the device to communicate natively using whichever protocol the destination supports, without requiring any translation or tunneling mechanism. It is the simplest and most widely recommended transition approach.

• A. Automatic encryption of all IPv6 traffic
• B. Eliminates the need for IPv6 firewall rules
• C. Better performance since there is no encapsulation/decapsulation processing Correct answer
• D. No MTU reduction from encapsulation overhead Correct answer

Options D and C are correct because native dual stack provides: (D) no MTU reduction, since there is no encapsulation overhead — IPv6 packets use the full link MTU, unlike tunneling which adds at least 20 bytes for the outer IPv4 header; and (C) better performance, since routers do not need to perform encapsulation and decapsulation processing for every packet, reducing CPU load and latency.

• A. All three links equally
• B. The R1-LAN1 link (ether2)
• C. The ISP-R1 link (ether1) Correct answer
• D. The R1-LAN2 link (ether3)

Option C, the ISP-R1 link (ether1), is correct because the topology labels that link with both an IPv4 address (192.0.2.1/30) and an IPv6 address (2001:db8:1::1/64) configured together, while ether2 and ether3 toward the LANs show only IPv6 addressing.

• A. /ipv6 test-connection
• B. /system health ipv6
• C. /tool bandwidth-test with IPv6 mode
• D. /ping with an IPv6 address Correct answer

Option D is correct because MikroTik RouterOS uses the /ping command (or /tool ping in older syntax) for both IPv4 and IPv6 connectivity testing. When an IPv6 address is specified as the target, the command automatically sends ICMPv6 Echo Request messages (Type 128) and reports ICMPv6 Echo Reply responses (Type 129). There is no separate IPv6-specific ping command.

• A. The prefix-length that defines the size of each individual delegation Correct answer
• B. The lease duration for the pool itself
• C. The master prefix that defines the overall address space of the pool Correct answer
• D. The DNS server address to include in delegated prefixes

Options C and A are correct because creating an IPv6 pool for DHCPv6-PD requires: (C) the master prefix (e.g., 2001:db8::/32) that defines the overall address space available for delegation; and (A) the prefix-length (e.g., 48 or 56) that determines the size of each individual prefix delegated to requesting clients. DNS and lease duration are configured elsewhere in the DHCPv6 server settings.

• A. 2001:db8:e100::/64
• B. 2001:db8:e000:1::/64
• C. 2001:db8:e000:3::/64 Correct answer
• D. 2001:db8:e000:2::/64

Option C, 2001:db8:e000:3::/64, is correct because the topology shows R1's /56 delegation already split into 2001:db8:e000:1::/64 (the R1-R2 link) and 2001:db8:e000:2::/64 (the R2-LAN link), leaving subnet 3 as the next unused /64 within the delegated range — 2001:db8:e100::/64 falls outside the /56 entirely.