Examkin

Soru

Zorluk: Çok zorFirst Hop Redundancy Protocols (HSRP and VRRP)

An enterprise network administrator is deploying First Hop Redundancy Protocols across two Cisco Catalyst routers, R1 (primary, physical IP 192.168.10.2/24192.168.10.2/24) and R2 (secondary, physical IP 192.168.10.3/24192.168.10.3/24), servicing subnet 192.168.10.0/24192.168.10.0/24. The administrator is evaluating feature parities and operational behaviors between HSRPv2 and VRRPv3 for dual-stack IPv4/IPv6 resilience.

Which two statements accurately describe the operational differences and configuration mechanics between HSRPv2 and VRRPv3 in this environment? (Choose two.)

  1. VRRPv3 permits the virtual IP address to be identical to the physical interface IP address of the Master router (setting its priority automatically to 255), whereas HSRPv2 requires the virtual IP to be a unique IP address distinct from any physical interface IP assigned to routers in the standby group.Cevap
  2. VRRPv3 preemption is enabled by default when configuring a VRRP group, whereas HSRPv2 requires explicit configuration of the preemption command for a higher-priority router to claim the Active role upon boot or recovery.Cevap
  3. C
    Configuring the HSRPv2 virtual IP address to match R1's physical IP address (192.168.10.2192.168.10.2) is supported in Cisco IOS XE and automatically elevates R1's HSRP priority value to 255.
  4. D
    HSRPv2 uses multicast IPv4 address 224.0.0.18224.0.0.18 and virtual MAC prefix `0000.5E00.01xx`, whereas VRRPv3 uses multicast IPv4 address 224.0.0.102224.0.0.102 and virtual MAC prefix `0000.0C9F.Fxxx`.

Cevap

The correct statements are: (1) VRRPv3 permits using the physical interface IP address as the virtual IP (which automatically forces priority to 255), while HSRPv2 mandates a unique virtual IP; and (2) VRRPv3 has preemption enabled by default, whereas HSRPv2 requires explicit configuration of the preemption command.
VRRPv3 supports IP address ownership where the virtual IP matches the physical interface IP of the master router, automatically setting priority to 255. Additionally, VRRP preemption is enabled by default. In contrast, HSRP requires a unique virtual IP address not assigned to any physical interface, and requires the explicit 'standby preemption' command to allow a higher-priority router to claim the Active role.

Adım Adım Çözüm

1
Analyze Virtual IP Address Assignment Rules for HSRP and VRRP
VRRP allows the IP Address Owner to share its physical interface IP with the virtual IP address, giving it an unalterable priority of 255. HSRP requires that the virtual IP address be unassigned to any physical interface in the local group to prevent ARP and routing loop issues.
Understanding protocol specification RFCs (RFC 5798 for VRRPv3 vs Cisco proprietary HSRPv2 specs) is essential for proper IP addressing design.
2
Analyze Default Preemption Behavior
VRRP router processes preempt higher-priority backup nodes by default unless explicitly disabled using 'no vrrp preempt'. HSRP router processes do not preempt active nodes by default, requiring 'standby <group> preempt' to be configured on primary nodes.
Failing to configure preemption on an HSRP primary router will cause sub-optimal traffic flow after a router reboots.
3
Verify Multicast Addresses and Virtual MAC Allocations
HSRPv1 uses 224.0.0.2224.0.0.2 (`0000.0C07.ACxx`), HSRPv2 uses 224.0.0.102224.0.0.102 (`0000.0C9F.Fxxx`), and VRRPv2/v3 uses 224.0.0.18224.0.0.18 (`0000.5E00.01xx`).
Distinguishing between multicast control planes and MAC structures avoids misidentifying frame header captures.

Anahtar Kavram

First Hop Redundancy Protocol (FHSRP) Operational Mechanics and Feature Comparison
Bu soruyu puanla

Konular

First Hop Redundancy Protocols (HSRP and VRRP)

Bu konudan daha fazla soru