Flashcards Flashcards by Leslie Book

Configures global password encryption in a
running configuration. Any passwords that were
not previously encrypted will be encrypted. In
addition, any passwords that are created in the
future, will be encrypted in the running
configuration.

service password-encryption

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The content addressable memory table, is
used to record a endpoint mac addresses
and it’
s corresponding switch port location

CAM table

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Advanced Encryption Standard (AES) is used
by both Wi-Fi Protected Access 2 (WPA2) and
WPA3 to provide encryption

Wireless Encryption

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Every LEAF must be connected to every SPINE

Cisco ACI architecture

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Application layer protocols that use TCP

FTP
HTTP
HTTPS
SSH

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IEEE 802.3ad standard that provides link
aggregation groups (LAGs) to bundle
multiple interfaces into one logical interface

Link Aggregation Control Protocol (LACP)

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Authentication, Authorization, and Accounting (AAA)

Authentication – the process of verifying a
user’s identity
Authorization – the process of verifying the
level of access configured for a user
Accounting – the process of recording the
use of resource

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Multiple virtual machines (VMs) can be running
simultaneously on a single host computer. A VM
is an isolated environment running a separate
operating system (OS) while sharing hardware
resources with a host machine
‘
s OS

Virtual Machines (VM)

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Broadcast Addresses

L3 Broadcast IP Address - 255.255.255.255
L2 Broadcast Mac Address - FF-FF-FF-FF-FF-FF

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VTP Default Mode

By default VTP is in server mode, which is an
operational mode that enables you to manage
VLANs on the local switch’
s database and use
the information in the database to synchronize
with other switches

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How to set a VLAN as untagged on a trunk port

In Cisco speak the Native VLAN is referring to the
one VLAN that will be passed untagged on a trunk
port. The command shown below is used to define
the untagged (native) VLAN.
interface #
switchport trunk native vlan #

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Show CDP Neighbor Output

Device ID
Local connected interface
Remote connected interface
Product and model information

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Cisco proprietary FHRP
Router/L3 Switch with the highest priority
is referred to as the active router

Hot Standby Router Protocol (HSRP)

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OSPF and Serial Interfaces

By default both PPP and HDLC interfaces are
set as the OSPF point-to-point network type

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Wireless QoS Levels *Worst to Best

Bronze
Silver *Default
Gold
Platinum

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SSH Requirements

Image that supports K9 (crypto)
Hostname and domain-name
Crypto key generated

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Cisco Meraki Devices

Deployed via a cloud based solution
Require an internet connection
Automatically register to your cloud account
with serial number association

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EIGRP Administrative Distances

Internal learned routes - 90
External learned routes - 170
Summary routes - 5

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OSPF and default-information originate

Will not advertise to any other routers
without a default route in the routing table.
If the
“
always
” keyword is added, it will
advertise a default route even if there is no
default route in the routing table.

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Configuration Management tools that use Ruby

Chef
Puppet

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Wireless 2.4GHZ Non-Overlapping Channels

1
6
11

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Used to differentiate the virtual MAC
addresses of the various HSRP groups
Defined by a special virtual MAC address
format where xx is the group
-Version 1: 0000.0007.ACxx
-Version 2: 0000.0C9F.Fxxx

HSRP Group Number

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File transfer protocol
Uses UDP and port 69

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TFTP

Processed sequentially from the first entry
in the list to the last entry
Apply extended ACL near source
Apply standard ACL near destination

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Access-Lists (ACL)

Management Tools that use SSH

Ansible

BPDU Guard

Feature used to protect switchports from receiving STP BPDUs, however the port can transmit STP BPDUs. When a STP BPDU is received on a BPDU Guard enabled port, the port is shutdown and the state of the port changes to ErrDis (Error-Disable) state

IaaS Service Model

A type of cloud computing service that offers essential compute, storage, and networking resources on demand, on a pay-as-you-go basis The consumer does not have control over the physical infrastructure in the cloud

GLBP

A Cisco-proprietary First-Hop Redundancy Protocol (FHRP) that elects an active virtual gateway (AVG) and up to four primary active virtual forwarders (AVFs)

Translates domain names to IP addresses to make internet destinations humanly readable. Uses both TCP and UDP *Example: www.cisco.com = 23.7.111.4

Domain Name System (DNS)

A 24-bit number that uniquely identifies a vendor, manufacturer, or other organization In the first three octets of the MAC address *Example: C8:E2:65:2D:14:5B C8:E2:65 = Intel Corporate

MAC Address Organizationally Unique Identifier (OUI)

Must be unique in each routing topology 32-bit value in dotted decimal notation If not manually configured, it will be the highest loopback IP address. If a loopback IP address is not configured, then it will be the highest IP address among the configured interfaces

Router IDs

4 byte field that appears last in an ethernet frame Provides a cyclic redundancy check (CRC) that is intended to enable a frame ' s receiver to determine whether the frame has been corrupted in transit

Frame Check Sequence (FCS)

EIGRP Metrics

Bandwidth *Used by default Load Delay *Used by default Reliability MTU

IETF Standard based FHRP The virtual MAC address for VRRP groups is in the form of 0000.5E00.01n; where n is a hexadecimal value identifying the VRRP group number

Virtual Router Redundancy Protocol (VRRP)

Encode data in both XML and JSON format Northbound APIs are used by an SDN controller to communicate with applications in the application plane Southbound APIs enable an SDN controller to communicate with devices in the data plane

REST APIs

Most mature and the most widely used Uses HTTPS with TCP port 8140

Puppet Configuration Management Tool

802.1w Natively includes PortFast, UplinkFast, and BackboneFast Faster convergence than 802.1D

Rapid Spanning Tree Protocol (RSTP)

If this command is entered on an interface, then the neighbor command is required to establish an OSPF adjacency. This is because it sets the OSPF network type as nonbroadcast.

ip ospf network non-broadcast

Collapsed Core

A two-tier network design, the core and distribution layers are combined together into a single layer

Cisco DNA Center

Centralized management solution that supports Cisco Software-Defined Access (SDA)

spanning-tree guard root

Root guard is used to prevent newly introduced switches from being elected as the new root switch If superior BPDUs are received on a port enabled with root guard, the port enters the root-inconsistent state and stops forwarding

Random early detection (RED) and weighted RED (WRED)

RED mitigates the problems caused by global TCP synchronization by randomly dropping packets as congestion increases and before the queue becomes full WRED improves upon RED by adding support for QoS values to assign drop thresholds

Route Administrative Distance (AD)

Used in order to select the best routed path when there are two or more different routes to the same destination from two different routing protocols Lowest AD is considered to be the best route *Example: EIGRP AD of 90 is preferred over OSPF AD of 110

Floating Static Route

Used as a backup route for when primary routes are removed from the routing table In the example below "Route2" is floating since it has a higher AD than "Route1" Route1 - ip route 0.0.0.0 0.0.0.0 10.0.1.1 5 Route2 - ip route 0.0.0.0 0.0.0.0 10.0.1.2 10

Spanning-Tree PortFast

Causes a switch or trunk port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states

OSPF 2WAY/DROTHER State

Neighbor routers that are neither the designated router (DR) nor the backup designated router (BDR) remain in the 2-Way state and are considered to be a DROTHER

Router Lookup Order

1.Check for the longest prefix match 2.Lowest administrative distance 3.Lowest routing metric

OSPF Backbone Area

When all OSPF devices in a topology are connected via networks in area 0 (ID 0.0.0.0) Core of an OSPF network

PAT Overload

NAT Overloading or Port Address Translation (PAT) is a modified form of dynamic NAT where more than one inside local address (Private IP)are translated to the same inside global address (Public IP)

Full Mesh Topology

When all devices are connected in a network topology

What is a primary advantage of using a three-tier architecture for interconnecting buildings on a corporate campus?

It enhances scalability by allowing easy addition of new buildings through a structured hierarchy.

What distinguishes Top-of-Rack (ToR) switches in a spine-leaf data center architecture?

They act as leaves, connecting both to servers within the rack and spine switches.

Which WAN technology provides dedicated bandwidth and predictable latency for connecting two sites without high bandwidth requirements?

Point-to-Point connection using PPP.

What combination of network devices is most appropriate for a small office with a mix of wired and wireless devices?

A wireless router with built-in Ethernet ports, connected to an external cable modem.

Which cloud deployment model best fits the objectives of combining flexibility of cloud resources with the security of in-house systems?

Hybrid Cloud.

Flashcards

(55 cards)