IP Services

A network administrator is configuring Port Address Translation (PAT) on a Cisco IOS router. Internal hosts on subnet $10.45.10.0/24$ connect to interface `GigabitEthernet0/0/0`, while interface `GigabitEthernet0/0/1` connects to the Internet Service Provider. Standard access list 10 has been configured with `access-list 10 permit 10.45.10.0 0.0.0.255`. Which TWO configurations are required on the router to correctly enable inside source PAT sharing the public IPv4 address of `GigabitEthernet0/0/1`?

A network administrator is configuring Port Address Translation (PAT) on a Cisco IOS router to map internal host traffic matched by access list $15$ to the IPv4 address assigned to public WAN interface $\text{GigabitEthernet0/0/1}$. The inside and outside interfaces have already been designated using `ip nat inside` and `ip nat outside`, and `access-list 15 permit 172.16.10.0 0.0.0.255` is active. What exact Cisco IOS global configuration command must be entered to complete this Port Address Translation configuration?

A network administrator configures Port Address Translation (PAT) on a Cisco IOS router so that internal hosts on the $10.10.50.0/24$ network can access external services through WAN interface GigabitEthernet0/0/1. The access list and global translation rules are configured as follows:

text
access-list 105 permit ip 10.10.50.0 0.0.0.255 any
ip nat inside source list 105 interface GigabitEthernet0/0/1 overload

During testing, internal clients cannot access external websites, and running `show ip nat translations` produces no output. An inspection of the interface configuration reveals:

text
interface GigabitEthernet0/0/0
description LAN Gateway
ip address 10.10.50.1 255.255.255.0
!
interface GigabitEthernet0/0/1
description WAN Interface
ip address 203.0.113.2 255.255.255.252
ip nat outside

Which configuration step on the router is required to enable successful address translation for the internal clients?

A network administrator is configuring Network Address Translation (NAT) on a Cisco IOS router interface connected to the internal local area network (GigabitEthernet0/0). What exact Cisco IOS interface configuration command designates this interface as the internal side for NAT translation?

A network administrator needs to configure a one-to-one static Network Address Translation (NAT) mapping on a Cisco IOS router. The internal host with private IPv4 address $10.1.1.50$ must be statically translated to the public IPv4 address $198.51.100.50$. What exact Cisco IOS global configuration command should be entered to establish this static NAT mapping?

A network administrator needs to configure Port Address Translation (PAT) on a Cisco IOS router so that multiple internal hosts defined in Access Control List 1 can share the IP address assigned to the WAN interface GigabitEthernet0/0/1. Which command correctly completes this configuration?

A network administrator is troubleshooting DNS name resolution in an enterprise network. A client host issues a standard DNS query to an internal recursive DNS server. However, the DNS response payload exceeds 512 bytes because the zone lookup returns a large list of resource records. How does DNS handle transport layer communication when standard UDP responses exceed this size threshold?

A network administrator configures dynamic NAT on a Cisco IOS router using an IP pool named `INTERNET_POOL` ($198.51.100.1$ to $198.51.100.2$) for hosts in the $10.20.30.0/23$ internal network. During testing, users observe that after two internal hosts establish outbound connections, no other internal hosts can access external sites. The output of `show ip nat statistics` shows total translations equal to $2$ ($0$ static, $2$ dynamic, $0$ extended).

Configuration snippet:
text
ip nat pool INTERNET_POOL 198.51.100.1 198.51.100.2 netmask 255.255.255.252
access-list 15 permit 10.20.30.0 0.0.1.255
ip nat inside source list 15 pool INTERNET_POOL

Which TWO statements correctly identify the root cause of this issue and the solution required to allow all internal hosts to translate concurrently? (Select two.)

An enterprise workstation is configured with a primary DNS server address of 10.10.20.5. The user attempts to access an external website by entering `service.partnercloud.com` into a web browser. The internal DNS server (10.10.20.5) is operational and has recursion enabled, but it currently has no cached record or authoritative zone file for `partnercloud.com`. Which statement accurately describes the name resolution role and process performed by the internal DNS server to resolve this request?

An administrator examines the following output from a Cisco router after configuring Network Address Translation to map private addresses to a defined address pool:

text
Router# show ip nat statistics
Total active translations: 1 (0 static, 1 dynamic; 0 extended)
Outside interfaces:
GigabitEthernet0/1
Inside interfaces:
GigabitEthernet0/0
Hits: 14 Misses: 0
Dynamic mappings:
-- Inside Source
[id 1] access-list 10 pool NAT_POOL refcount 1

Users on the internal subnet report that only one device at a time can successfully communicate with external networks. Which configuration change will resolve this issue and allow multiple concurrent internal hosts to share the translation pool?

An enterprise workstation needs to access a web server using its Fully Qualified Domain Name (FQDN). Arrange the steps of the DNS name resolution process in the correct chronological order from first to last.

A network administrator is configuring Port Address Translation (PAT) on a Cisco router so that internal hosts on the $10.1.1.0/24$ subnet can access the Internet using the public IP address assigned to the WAN interface $GigabitEthernet0/0/1$. Access List $1$ has already been configured to permit traffic from $10.1.1.0/24$. Which two actions are required to complete this PAT configuration? (Select two.)

An enterprise workstation attempts to connect to an external service by domain name (web.example.com) for the first time. Arrange the following DNS lookup and name resolution steps in the correct sequential order from the client's initial request to receiving the final IP address.

A network administrator is implementing Port Address Translation (PAT) using an IP address pool on a Cisco IOS router. Internal devices belong to the $172.16.0.0/12$ private network range. Standard IP access list $15$ has already been created to identify inside traffic with the command `access-list 15 permit 172.16.0.0 0.15.255.255`. The public IP addresses assigned by the ISP for translation are $203.0.113.10$ through $203.0.113.14$ with subnet mask $255.255.255.248$. Which TWO configuration commands must be executed on the router to correctly instantiate the pool and map the inside ACL traffic to allow multiple internal hosts to share these public IP addresses simultaneously?

In an enterprise network environment, host computers rely on various network services to locate resources efficiently. Which fundamental role is performed by a Domain Name System (DNS) server during host-to-host communications?

A network engineer is configuring Port Address Translation (PAT) on a Cisco IOS router using a dynamic NAT pool named $PUBLIC_POOL$ ($203.0.113.10$ to $203.0.113.12$). Internal endpoints reside on the $172.16.10.0/24$ network, which is matched by standard Access Control List 15. Which two configuration actions must be performed on the router to correctly enable PAT for internal hosts and designate interface directionality? (Select two.)

An administrator needs to configure Port Address Translation (PAT) on a Cisco IOS router to allow multiple internal hosts matched by Access Control List 15 to share the single IPv4 address assigned to interface GigabitEthernet0/1 for internet access. Which command correctly enables this configuration?

A network engineer is configuring Port Address Translation (PAT) using an IP address pool on a Cisco IOS router. An access list named ACL_LAN (ACL 10) matches internal traffic, and an IP address pool named GIG_POOL has been defined for global addresses. What exact global configuration command completes this PAT configuration by linking access list 10 to GIG_POOL with port overload capability?

A network administrator is configuring Port Address Translation (PAT) on a Cisco IOS router to allow internal users access to the Internet using a single public IP address assigned to the GigabitEthernet0/1 interface. The administrator has already configured the Access Control List (ACL) and the inside/outside interfaces. What exact Cisco IOS keyword must be appended to the end of the 'ip nat inside source list 1 interface GigabitEthernet0/1' command to enable port-level address translation?

An administrator is reviewing DNS lookup behaviors and transport protocol characteristics for enterprise host name resolution. Which two statements correctly describe DNS operations and protocol roles during name resolution? (Choose two.)