Network Operations

An enterprise data center utilizes two edge routers, Edge-1 and Edge-2, configured with Hot Standby Router Protocol (HSRP) to provide default gateway redundancy for internal LAN clients. Edge-1 is configured with an HSRP priority of 120, while Edge-2 is configured with the default priority of 100. Both routers connect to downstream switches via their LAN interfaces and to separate ISP providers via their WAN interfaces. During a line cut on Edge-1's WAN circuit, internal LAN clients report a complete loss of internet connectivity. Network monitoring shows that Edge-1 remains the active HSRP router and continues accepting LAN traffic. Which of the following is the most likely cause of this failover failure?

A network administrator configures a pair of routers using a First Hop Redundancy Protocol (FHRP) to ensure high availability for a subnet. During scheduled maintenance on the primary router, the secondary router successfully assumes the active role according to the system logs. However, workstations on the subnet immediately lose access to external networks. Which of the following is the most likely cause of this connectivity failure?

During a scheduled maintenance window, a network technician updates the operating system of a primary enterprise router. Immediately after the device reboots with the newly installed firmware image, all recent ACL modifications and custom static routes disappear, causing routing failures across multiple subnets. An audit reveals that recent configuration changes resided solely in volatile memory when the firmware installer triggered the system reload. Which critical pre-patch maintenance procedure was omitted prior to executing the software update?

Following an emergency vulnerability disclosure, a network engineering team must apply a critical operating system patch to a high-availability core switch cluster without causing network downtime. Which of the following procedures should the team execute to ensure continuous service availability and full recovery capability during this maintenance operation? (Select TWO).

During a post-incident audit of a multi-tier data center environment, an engineer discovers that inter-VLAN routing failure and unexpected high-availability failovers occurred because secondary database nodes were improperly connected to trunk ports missing native VLAN tags, while hosts were statically configured with individual physical interface IP addresses rather than shared gateway abstractions. Additionally, technicians were unable to physically locate the corresponding patch panel switchports during the outage due to missing physical layout records. Which of the following documentation components and procedural updates must be corrected and updated to fully remediate this environment? (Select TWO.)

A network operations team is auditing the event management and polling security parameters on core routers to meet strict regulatory compliance mandates. The regulatory framework requires two key controls: all remote system logging messages must be delivered using a connection-oriented protocol that guarantees transport-layer encryption, and all telemetry polling performed by network management stations must enforce both cryptographic user authentication and packet payload encryption.

Which of the following configuration steps must the administrator perform to satisfy these auditing mandates? (Select TWO.)

An enterprise deployment connects dual-homed application servers to two separate top-of-rack access switches using LACP (IEEE 802.3ad) NIC teaming for link redundancy, while two core routers run Virtual Router Redundancy Protocol (VRRP) to provide default gateway resiliency. Following a network migration, users report intermittent traffic loss during router failover tests, and LACP bundles on the servers fail to form properly. Which TWO of the following technical misconfigurations or architectural oversights are the primary causes of these issues?

A network engineer is upgrading an enterprise log auditing and monitoring infrastructure. Corporate compliance policies require that all network event logs sent to the central server, as well as SNMP polling traffic, provide confidentiality and integrity verification in transit. Which of the following configuration choices should the engineer implement to fulfill these security requirements? (Select TWO.)

A network technician is preparing to update the operating system firmware on several enterprise switches. Which of the following actions should the technician take prior to applying the update in the production environment? (Select TWO.)

A network technician is deploying high availability for enterprise servers connected to redundant access switches. Which TWO of the following technologies or mechanisms directly provide link aggregation and adapter redundancy at Layer 2?

A network administrator is designing a high-availability infrastructure for a datacenter rack connected to dual switches and redundant edge routers. The design must support link aggregation across physical network interfaces on dual-homed servers while also ensuring rapid Layer 3 gateway failover if an upstream WAN link drops. Which TWO of the following technical configurations should the administrator implement to meet these requirements?

An enterprise network engineering team is designing a high-security log forwarding and auditing infrastructure across multi-site edge routers. The compliance policy mandates that event log forwarding to the centralized SIEM must guarantee transport reliability and payload encryption, while active remote device telemetry queries must enforce both cryptographic user authentication and data payload privacy encryption. Which of the following configuration choices and protocols satisfy these requirement criteria? (Select TWO.)

A network team is preparing a maintenance window to perform a software operating system update on a high-availability core switch cluster operating in an active/standby state. Which TWO actions must the engineers execute to maintain service continuity and ensure rapid recovery if an issue arises?

A systems engineer is preparing to upgrade the operating system across multiple network security firewalls. Which of the following administrative tasks must be completed prior to applying the update to maintain change governance and ensure rapid system recovery? (Select TWO.)

An enterprise network utilizes two Layer 3 switches, Switch-A and Switch-B, to provide default gateway redundancy for VLAN 30 ($172.16.30.0/24$). Switch-A is configured as the HSRP Active router with a priority of 120 and preemption enabled, using Virtual IP (VIP) $172.16.30.1$ (physical IP $172.16.30.2$). Switch-B is the HSRP Standby router with a default priority of 100 and physical IP $172.16.30.3$. Switch-A is also configured as the STP Root Bridge for VLAN 30. During a routine host setup, a technician manually sets a critical server's default gateway address to $172.16.30.2$ instead of the HSRP VIP. Later, Switch-A's tracked WAN uplink fails, decreasing its HSRP priority by 30 points and causing Switch-B to assume the HSRP Active role. Which of the following best describes the immediate pathing behavior for outbound traffic originating from this server?

A network administrator is configuring SNMP management on a core network switch. Organizational policy mandates that telemetry and monitoring traffic must support both cryptographic user authentication and payload encryption. Which SNMPv3 security level meets these requirements?

An enterprise network technician is responding to recurring frame check sequence (FCS) and CRC error bursts on a 10GbE fiber optic link connecting a core switch to a newly installed modular SAN storage array across separate rooms in a data center. The fiber connection passes through multiple intermediate fiber distribution panels (FDPs) and structured patch bays. To systematically trace the specific optical strand IDs, bulkhead coupler locations, port assignments, and physical path terminations before dispatching a field engineer with an Optical Time-Domain Reflectometer (OTDR), which network document should the technician analyze first?

An enterprise network infrastructure utilizes dual core switches configured with Virtual Router Redundancy Protocol (VRRP) to provide default gateway redundancy for multiple VLANs. Downstream access switches connect to both core switches via multi-chassis trunking. During traffic baseline audits, network engineers notice significant asymmetric traffic flow and sub-optimal hairpinning (tromboning) across the inter-switch link between the core switches. Which of the following configuration changes and architectural adjustments will optimize Layer 2/Layer 3 path symmetry and eliminate unnecessary inter-switch link transit? (Select TWO.)

A network technician is setting up a Virtual Router Redundancy Protocol (VRRP) group between two routers to provide default gateway redundancy for hosts on Subnet $10.10.20.0/24$. Router 1 has interface IP $10.10.20.2$, Router 2 has interface IP $10.10.20.3$, and the Virtual IP (VIP) is configured as $10.10.20.1$. Which IP address must be configured as the default gateway on client computers within this subnet?

An organization deploys an active/standby pair of network gateways configured with a First Hop Redundancy Protocol to provide default gateway resiliency. During scheduled maintenance testing, when the primary active gateway is powered off, workstations on the local subnet immediately lose all outbound internet connectivity. Inspection reveals that internal workstations are receiving traffic normally within their local LAN, but failover routing does not resume internet access until the primary gateway is powered back on. Which misconfiguration is the most likely cause of this issue?