Mixed Deck — All Cisco ENCOR Topics Flashcards

What command parameter can be changed to encrypt data traffic?

Answer: Security model

The security model command set can be configured to enable data traffic encryption.

Which EtherChannel negotiation protocol is Cisco proprietary?

Answer: PAgP

Port Aggregation Protocol (PAgP) is Cisco's proprietary protocol for negotiating EtherChannel link bundles, whereas LACP is the IEEE 802.3ad standard.

In SNMPv3, which security level provides both authentication and encryption?

Answer: authPriv

The authPriv security level uses HMAC for authentication and DES/AES for privacy (encryption) of SNMP messages.

What does the 'ip helper-address' command accomplish on a Cisco router?

Answer: Forwards UDP broadcast packets to a specified unicast address

The ip helper-address command converts UDP broadcasts (including DHCP discover packets) into unicast packets forwarded to the specified server address.

(3) instructions to clear the NVRAM's data.

Answer: Write erase

All three commands—`write erase`, `erase startup-config`, and `erase nvram:`—effectively clear the startup configuration stored in Non-Volatile RAM (NVRAM) on a Cisco device. `write erase` is a legacy command, while `erase startup-config` is a more explicit and modern command for the same purpose. `erase nvram:` directly targets the NVRAM file system to remove the startup configuration, often done to reset a device to its factory default settings.

Which LSA type is generated by an ASBR to advertise external routes into the OSPF domain?

Answer: Type 5 (AS External LSA)

Type 5 AS External LSAs are originated by ASBRs and flooded throughout the entire OSPF domain except into stub areas.

______ handles label swapping and transfers data based on L3 or L2 information.

Answer: Data plane

The data plane, also known as the forwarding plane, is responsible for the actual forwarding of packets based on the information established by the control plane. In MPLS, the data plane performs label swapping and transfers data packets using the Label Forwarding Information Base (LFIB), which maps incoming labels to outgoing labels and interfaces, enabling high-speed packet delivery.

What is the default administrative distance of an OSPF inter-area (O IA) route in Cisco IOS?

Answer: 110

OSPF inter-area routes carry the same administrative distance of 110 as intra-area OSPF routes on Cisco IOS.

What kind of Wi-Fi encryption technique does pre-shared key (PSK) authentication normally employ?

Answer: AES

To achieve the highest level of security, Advanced Encryption Standard (AES) is often employed with Pre-Shared Key (PSK) authentication.

What constitutes a data frame's four components of MPLS information?

Answer: Label, Experimental, BS (last label in stack), TTL

An MPLS header consists of four distinct components: the 20-bit Label field for forwarding decisions, a 3-bit Experimental field often used for Quality of Service (QoS), a 1-bit Bottom of Stack (BS) flag indicating if it's the last label in a stack, and an 8-bit Time To Live (TTL) field to prevent loops and limit hop count.

What function does the monitoring workflow for the Cisco DNA Center serve?

Answer: To monitor and analyze the network for performance and health issues.

Monitoring and analysis of the network for performance and health issues is the primary goal of the Cisco DNA Center monitoring workflow.

In LISP, what does the ITR do when it cannot find an EID-to-RLOC mapping in its cache?

Answer: Sends a Map-Request to the Map Resolver

When the ITR has a cache miss, it sends a Map-Request to the Map Resolver to obtain the EID-to-RLOC mapping.

To connect to the Cisco switch, you would utilize a _______ cable.

Answer: UTP rolled cable

A UTP rolled cable, commonly known as a rollover or console cable, is specifically used to connect a computer's serial port (or a USB-to-serial adapter) to the console port of a Cisco switch or router. This cable allows direct, out-of-band access to the device's Command Line Interface (CLI) for initial configuration and troubleshooting. It has a specific pinout that "rolls over" the transmit and receive pins.

What is the primary role of a VTEP in a VXLAN network?

Answer: Encapsulate and decapsulate VXLAN packets

A VXLAN Tunnel Endpoint (VTEP) performs the encapsulation of Layer 2 frames into VXLAN/UDP and the reverse decapsulation.

Which 802.1X component authenticates the supplicant and communicates with the authentication server?

Answer: Authenticator

The authenticator (typically a switch or wireless AP) intercepts the supplicant's credentials and forwards them to the authentication server.

Which spanning tree port state forwards frames but does NOT learn MAC addresses?

Answer: Listening

In the Listening state, a port participates in spanning tree and can forward BPDUs, but it does not learn MAC addresses.

What is the function of a Cisco DNA Center intent-based networking API?

Answer: Express the desired network state and let the platform determine how to implement it

Intent-based networking APIs allow operators to declare the desired outcome, with DNA Center translating that intent into device-level configurations.

What does setting `ip ospf priority 0` on an interface accomplish?

Answer: Makes the router ineligible to become DR or BDR

Setting OSPF priority to 0 makes the router ineligible for DR/BDR election on that segment; only routers with priority ≥ 1 can be elected as DR or BDR.

A network engineer needs to prevent a specific BGP prefix from being advertised to an eBGP peer. Which mechanism is most appropriate?

Answer: Outbound route filter with a prefix-list

An outbound route filter using a prefix-list applied to the neighbor statement blocks specific prefixes from being sent to an eBGP peer.

Which protocol can be used to signal MPLS LSPs and also carries QoS traffic engineering constraints?

Answer: RSVP-TE

RSVP-TE (Resource Reservation Protocol - Traffic Engineering) signals LSPs and carries bandwidth and constraint information for TE tunnels.