IP Services

A network administrator is troubleshooting a DHCP relay issue on a Cisco IOS router. Host devices on VLAN 30 ($172.16.30.0/24$) use subinterface GigabitEthernet0/0.30 ($172.16.30.1$) as their default gateway. The centralized DHCP server is located at $10.10.10.50$, connected off router interface GigabitEthernet0/1 ($10.10.10.1$).

Packet captures at the DHCP server reveal that incoming relayed DHCP DISCOVER messages contain a Relay Agent IP Address (`giaddr`) of $10.10.10.1$ instead of $172.16.30.1$. Consequently, the DHCP server fails to assign addresses from the intended $172.16.30.0/24$ pool.

Which router misconfiguration causes the `giaddr` field to be set to $10.10.10.1$?

A security review on an enterprise switch named Core-SW1 reveals that virtual terminal sessions allow plain-text remote management and bypass local account verification. To harden management access on Core-SW1, which TWO commands must be configured specifically under line VTY configuration mode (config-line) to enforce local account credentials and restrict incoming traffic exclusively to SSH?

A network administrator is configuring Quality of Service (QoS) classification using Differentiated Services (DiffServ) on an enterprise router. How many bits are allocated to the Differentiated Services Code Point (DSCP) field within the IPv4 Type of Service (ToS) byte?

A network administrator executes the global configuration command `logging trap 4` on a Cisco IOS router that is configured to forward log messages to an external syslog server. Shortly after, an interface status change occurs, generating a syslog event message with severity level 5 (Notifications). How does the router handle this message regarding transmission to the remote syslog server?

A network administrator configures a Cisco router WAN egress interface with a Modular QoS CLI (MQC) policy map. The policy assigns real-time Voice over IP (VoIP) traffic to a class using the `priority 512` command, while transactional data is assigned to a class using the `bandwidth 2048` command. During a period of interface congestion, incoming voice traffic spikes to $768\text{ kbps}$. Which statement accurately describes how the router handles the voice traffic that exceeds the $512\text{ kbps}$ allocated threshold?

An enterprise network engineer is configuring a Cisco IOS router (R1) to forward DHCP requests from client hosts located on subnet $10.50.1.0/24$ to a centralized DHCP server with IPv4 address $172.16.10.25$. Client hosts connect directly to R1 via interface GigabitEthernet0/0/1 ($10.50.1.1/24$), while interface GigabitEthernet0/0/0 ($172.16.1.1/24$) routes traffic toward the DHCP server network. Which configuration command must be applied to ensure R1 properly relays client DHCP broadcast requests to the server?

An enterprise network engineer is analyzing DNS name resolution behavior across internal workstations and external edge firewalls. The infrastructure uses an internal Active Directory DNS server that forwards unknown domain requests to an external resolver. Which two statements correctly describe DNS transport protocol operation and name resolution roles in this environment?

An enterprise WAN edge router frequently transmits micro-bursts of database traffic that temporarily exceed the contract rate limit set by the service provider. The network engineer must implement a Quality of Service (QoS) mechanism on the egress WAN interface that regulates outbound transmission rates to match the provider's limit by holding excess packets in memory queues for later transmission rather than immediately dropping them. Which QoS mechanism should be configured on the router interface?

To permit multiple internal private hosts to share the single public IPv4 address assigned to the GigabitEthernet0/0/0 WAN interface, which Cisco IOS command correctly implements Port Address Translation (PAT) for traffic permitted by Access Control List 15?

A network administrator is setting up Port Address Translation (PAT) on a Cisco IOS router using a public address pool named `PAT_POOL` and Access Control List `5`. Which two commands are required to correctly establish PAT and configure the LAN interface to participate in address translation? (Select two.)

A network administrator configures a Cisco IOS router to synchronize its internal clock with an enterprise NTP server operating at Stratum 2. Arrange the operational steps in chronological order from initial packet transmission to the point where the router can act as a valid time source for downstream clients.

A network engineer is configuring Port Address Translation (PAT) on a Cisco IOS router using an IP NAT pool named `INTERNET_POOL` for internal endpoints matched by access list `10`. Which global configuration command correctly enables PAT using this address pool?

An administrator needs to configure Port Address Translation (PAT) on a Cisco IOS router so that all internal hosts on the subnet $172.16.50.0/24$ can access the Internet using the IPv4 address assigned to the WAN interface GigabitEthernet0/1. Interface GigabitEthernet0/0 connects to the internal LAN. Which configuration set correctly accomplishes this requirement?

A network administrator is reviewing telemetry and alerting mechanisms across enterprise Cisco routers. Which TWO statements accurately describe the operational differences between SNMP traps and SNMP informs? (Select TWO.)

A network engineer is troubleshooting internet connectivity issues on a Cisco IOS router configured for Network Address Translation. Internal hosts on the $10.10.10.0/24$ network report that only one host can access external resources at any given time. Subsequent host traffic is dropped. The engineer inspects the router configuration and operational state using verification commands:

text
Router# show ip nat statistics
Total active translations: 1 (0 static, 1 dynamic, 1 extended)
Outside interfaces:
GigabitEthernet0/1
Inside interfaces:
GigabitEthernet0/0
Hits: 48 Misses: 12
CEF Translated packets: 48, Fast Switched packets: 0
Expired translations: 15
Dynamic mappings:
-- Inside Source
[id 1] access-list 101 pool INTERNET-POOL refcount 1
pool INTERNET-POOL: netmask 255.255.255.252
start 203.0.113.1 end 203.0.113.1
type generic, total addresses 1, allocated 1 (100%), misses 12

Router# show running-config | include ip nat
ip nat pool INTERNET-POOL 203.0.113.1 203.0.113.1 netmask 255.255.255.252
ip nat inside source list 101 pool INTERNET-POOL
access-list 101 permit ip 10.10.10.0 0.0.0.255 any

Which configuration change is required to allow all internal hosts on the $10.10.10.0/24$ network to share the single public IPv4 address simultaneously?

An enterprise network administrator is updating the SNMP monitoring configuration on a Cisco IOS XE core router to meet strict security and monitoring compliance standards. The updated policy mandates two specific requirements for outbound system event notifications sent to the central Network Management System (NMS):
1. All notifications must be encrypted using AES privacy and cryptographically authenticated using SHA.
2. Outbound notifications must require explicit application-layer acknowledgments from the NMS, causing the router to resend notification packets if no acknowledgment is received.

Which combination of SNMP protocol settings and message types must be configured on the router to fulfill both requirements?

A network engineer is troubleshooting event notifications on a Cisco IOS XE router. During periods of heavy WAN link congestion, critical interface state notifications sent to the Network Management System (NMS) are occasionally dropped and lost. The organization mandates that all management notifications must require an explicit application-layer acknowledgment from the NMS to trigger retransmissions if unacknowledged, while ensuring message integrity, authentication, and payload encryption. Which SNMP configuration change satisfies both the operational delivery guarantee and security requirements?

A network administrator is configuring a Cisco IOS router to function as a DHCP server for a local subnet. To avoid IP address conflicts with statically configured devices such as default gateways and printers, the administrator must prevent the DHCP server from allocating addresses in the range 192.168.10.1 through 192.168.10.10. Which command should be executed in global configuration mode to accomplish this requirement?

A network technician needs to verify the configured SSH version, authentication timeout, and maximum retry limits on a Cisco IOS switch named SW-Access-01. Which privileged EXEC mode command provides this specific operational summary?

A network administrator is configuring Port Address Translation (PAT) on an enterprise Cisco IOS router. The internal subnets matched by Access Control List 15 require multiple internal IP addresses to share a dynamic pool of public IPv4 addresses named $GUEST_NAT_POOL$. Which Cisco IOS global configuration command correctly enables PAT using this dynamic address pool?