Which statement correctly describes the B4 element in a DS Lite architecture?

It is the provider-side tunnel concentrator that performs NAT44

It is a stateless translator that maps IPv6 addresses to IPv4 addresses

It is the customer edge device that encapsulates IPv4 packets in IPv6 and sends them to the AFTR

It is a DNS64 server that helps IPv6-only clients resolve IPv4 addresses

What is the role of DNS64 in a NAT64 deployment?

It provides a mapping between IPv6 prefixes and IPv4 addresses for stateless translation

It performs the actual translation of IPv6 packets to IPv4 packets

It synthesizes AAAA records from A records so IPv6-only clients can resolve IPv4-only servers

It translates IPv6 addresses into IPv4 addresses for the NAT64 device

What is a key characteristic of MAP-T as an IPv6 transition mechanism?

It uses a stateful tunnel concentrator to manage all IPv4 sessions

It requires a DNS64 server to synthesize AAAA records for IPv4 destinations

It is stateless and performs both encapsulation and translation of IPv4 packets over IPv6

It provides a one-to-one mapping between IPv4 and IPv6 addresses without port sharing

A service provider has deployed NAT64 to allow IPv6-only subscribers to reach IPv4-only servers. A subscriber reports that they can reach IPv4-only websites but cannot use a legacy IPv4-only application that uses raw IP packets (not TCP or UDP). What is the most likely reason for this failure?

The subscriber's CPE is not configured with a NAT64 prefix.

The NAT64 gateway does not support the translation of the application's IP protocol type.

The NAT64 gateway is performing NAT44 instead of NAT64.

The DNS64 service is not synthesizing AAAA records for the application's server.

A small enterprise has a single public IPv4 address from its ISP. The network administrator wants to allow 200 internal hosts to access the Internet. The administrator configures the edge router to translate the private IPv4 addresses of the internal hosts to the single public IPv4 address, using different source ports to distinguish the sessions. What is this translation technique called?

NAT44 with port address translation (PAT)

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Domain 2Objective 7

2.7 Describe IPv6 Transition (NAT44, NAT64, CGNAT, MAP-T and DS Lite) 350-501 Practice Questions (Page 3)

Part of the Networking domain, which accounts for 30% of the 350-501 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~15–24 in this domain), expect 2–3 from this objective — we provide 24 practice questions to prepare you well beyond it. (estimate)

24questions here

5free pages

5concepts

30%of the exam

Questions 11–15

11foundation · easy
Which statement correctly describes the B4 element in a DS Lite architecture?
Select an answer first
12foundation · easy
What is the role of DNS64 in a NAT64 deployment?
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13foundation · easy
What is a key characteristic of MAP-T as an IPv6 transition mechanism?
Select an answer first
14application · medium
A service provider has deployed NAT64 to allow IPv6-only subscribers to reach IPv4-only servers. A subscriber reports that they can reach IPv4-only websites but cannot use a legacy IPv4-only application that uses raw IP packets (not TCP or UDP). What is the most likely reason for this failure?
Select an answer first
15application · easy
A small enterprise has a single public IPv4 address from its ISP. The network administrator wants to allow 200 internal hosts to access the Internet. The administrator configures the edge router to translate the private IPv4 addresses of the internal hosts to the single public IPv4 address, using different source ports to distinguish the sessions. What is this translation technique called?
Select an answer first

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