The -c option in Xmodem file transfers is used to enable CRC (Cyclic Redundancy Check) for enhanced

error checking. Here's why it's the correct answer:

Error Detection: CRC is a more robust error detection mechanism compared to the standard

checksum method used in Xmodem. It provides greater reliability in identifying file corruption during

the transfer.

Flash Memory: Since flash memory on a Cisco router or switch stores critical data like configuration

files or the IOS image, ensuring the integrity of transferred files is crucial.

Why other options are incorrect:

-e, -r, -x: These are not standard Xmodem options for error checking purposes. While some

implementations may have custom flags, they are not universally applicable.

Important Note: Xmodem is a legacy protocol that is often replaced by more reliable options like

TFTP in modern Cisco devices. However, understanding Xmodem options is still relevant for certain

cases or older equipment.

Reference:

Xmodem overview: https://en.wikipedia.org/wiki/XMODEM

Cyclic Redundancy Check (CRC): https://en.wikipedia.org/wiki/Cyclic_redundancy_check

Microsoft Notepad is the preferred text editor for working with Cisco configuration files and other

simple text documents for several reasons:

Plain Text Focus: Notepad is designed specifically for plain text editing. It does not add any

formatting, hidden characters, or metadata that could interfere with the configuration file's

structure.

Cisco Syntax Compatibility: Cisco configurations rely on specific syntax and spacing. Notepad

preserves these elements accurately.

Universality: Notepad is a basic text editor included in all versions of Windows, ensuring accessibility

and eliminating the need for additional software.

Why other options are not ideal:

Microsoft Word: Word is a word processor and includes formatting, fonts, and other features that are

not compatible with Cisco configuration files. This formatting can corrupt the configuration.

Microsoft Access: Access is a database management system, not suited for text file editing.

Microsoft Excel: Excel is a spreadsheet application and adds its own structure and formatting that

conflicts with configuration file formats.

The correct IPv6 address notation follows the format of eight groups of four hexadecimal digits,

separated by colons. The address must have exactly eight groups unless it uses the double colon (::)

to represent consecutive groups of zero value. The double colon can only appear once in an address

to avoid ambiguity.

Option A is incorrect because it includes a subnet mask (/128) which is not part of the actual address

notation. Option B is incomplete as it does not contain enough groups and ends with a single colon.

Option C has too many groups (nine instead of eight) and is therefore not a valid IPv6 address. Option

D is the correct notation with eight groups of four hexadecimal digits, where necessary leading zeros

are included.

Reference :=

IPv6 Address Types, Notation, and Structure Explained1.

IPv6 address formats - IBM2. =========================

The decompressed form of Cisco IOS Software and the running configuration are stored in DRAM

(Dynamic Random-Access Memory) on Cisco devices. DRAM is used as the main memory for the

device, where the operating system runs and the running configuration is stored. When a Cisco

device boots up, the IOS image is decompressed and loaded into DRAM, and the running

configuration is also held in this memory type. It’s important to note that DRAM is volatile memory,

which

means

its

contents

are

lost

when

the

device

is

powered

off

or

restarted12. Reference := Maintaining System Memory Configuration Guide, Cisco IOS Release

15M&T - Cisco, Types of memory on a Cisco device - Study-CCNA

RJ-45 is the standard connector used for Ethernet networks. Here's why it's the correct answer:

Compatibility: Ethernet ports on both laptops and Cisco switches use RJ-45 connectors. This makes

RJ-45 cables ideal for direct connections between these devices.

Appearance: RJ-45 ports are rectangular and slightly larger than typical phone jacks (RJ-11). They

have eight metal pins inside.

Why other options are incorrect:

DVI: DVI ports are used for video connections between computers and displays.

RJ-11: RJ-11 ports are primarily associated with analog phone lines and are smaller than RJ-45.

DB-9: DB-9 connectors were traditionally used for serial connections on older computers and

peripherals.