352-001 · Question #347
What are three advantages of using ISATAP? (Choose three.)
The correct answer is B. It is supported on many platforms, such as Linux, Windows, and Cisco IOS Software. C. It works with both private and public addressing spaces. E. It does not require any changes on the underlying IPv4 network to operate.. ISATAP is an IPv6-in-IPv4 tunneling mechanism that is broadly platform-supported, functions over private and public IPv4 space, and requires no modifications to the underlying IPv4 infrastructure.
Question
What are three advantages of using ISATAP? (Choose three.)
Options
- AIt is easier to set up than other tunneling mechanisms, such as 6RD and 6to4.
- BIt is supported on many platforms, such as Linux, Windows, and Cisco IOS Software.
- CIt works with both private and public addressing spaces.
- DIt is a point-to-multipoint tunneling mechanism.
- EIt does not require any changes on the underlying IPv4 network to operate.
How the community answered
(21 responses)- A5% (1)
- B90% (19)
- D5% (1)
Why each option
ISATAP is an IPv6-in-IPv4 tunneling mechanism that is broadly platform-supported, functions over private and public IPv4 space, and requires no modifications to the underlying IPv4 infrastructure.
ISATAP requires DNS configuration of an ISATAP router and manual host configuration steps, making it generally more complex to deploy than automatic mechanisms like 6to4 or 6RD.
ISATAP is implemented natively in Microsoft Windows, Linux kernels, and Cisco IOS, giving it wider cross-platform support than many other transition mechanisms.
Unlike 6to4, which requires globally routable public IPv4 addresses, ISATAP embeds the IPv4 address (including RFC 1918 private addresses) directly into the IPv6 interface identifier, allowing it to operate across private address space.
ISATAP creates individual logical point-to-point tunnels between each host and the ISATAP router rather than operating as a true point-to-multipoint tunnel interface.
ISATAP uses the existing IPv4 network purely as a link layer and does not require any routing changes, tunnel broker configurations, or special IPv4 infrastructure - hosts auto-configure their ISATAP addresses and tunnel endpoint from DNS.
Concept tested: ISATAP IPv6 transition mechanism characteristics
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/15-2s/ipv6-15-2s-book/ip6-tunnel.html
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