Answer / jerald

Proxy ARP (RFC 1027) is a way to make a machine physically
located on one network appear to be logically part of a
different physical network connected to the same
router/firewall. Typically it allows us to hide a machine
with a public IP address on a private network behind a
router, and still have the machine appear to be on the
public network "in front of" the router. The
router "proxys" ARP requests and all network traffic to and
from the hidden machine to make this fiction possible.

Consider a router with two interface cards, one connected
to a public network PUBNET and one connected to a private
network PRIVNET. We want to hide a server machine on the
PRIVNET network but have it accessible from the PUBNET
network. The IP address of the server machine lies in the
PUBNET network, even though we are placing the machine on
the PRIVNET network behind the router.

By enabling proxy ARP on the router, any machine on the
PUBNET network that issues an ARP "who has" request for the
server's MAC address will get a proxy ARP reply from the
router containing the router's MAC address. This tells
machines on the PUBNET network that they should be sending
packets destined for the server via the router. The router
forwards the packets from the machines on the PUBNET
network to the server on the PRIVNET network.

Similarly, when the server on the PRIVNET network issues
a "who has" request for any machines on the PUBNET network,
the router provides its own MAC address via proxy ARP. This
tells the server to send packets for machines on the PUBNET
network via the router. The router forwards the packets
from the server on the PRIVNET network to the machines on
the PUBNET network.

The proxy ARP provided by the router allows the server on
the PRIVNETnetwork to appear to be on the PUBNET network.
It lets the router pass ARP requests and other network
packets in both directions between the server machine and
the PUBNET network, making the server machine appear to be
connected to the PUBNET network even though it is on the
PRIVNET network hidden behind the router.

What is the default bandwidth size of t1 routers?

0 Answers  

---

To monitor IP igrp traffic, you can use "debug IP igrp transaction" or "debug IP igrp events". How do you display information about IPX routing update packets? A. debug routing B. debug ipx transaction C. debug ipx routing activity D. debug ipx events

2 Answers  

---

Identify 3 characteristics of a MAC address? A.) Burned into the NIC B.) 48 bits long C.) Length is 32 bits D.) Used to deliver the frame to the end device E.) Contains a network portion and a host portion

2 Answers  

---

CO is an acronym for which of the following? A.) Central Office B.) Capital Office C.) Central Operator D.) Company Office

1 Answers  

---

What is a key use of a device hardware address? A. to obtain a vendor code / serial number from the user B. to transmit a frame from one Interface to another Interface C. to transmit a packet from one local device to another local device D. to transmit data from one local device to a remote device across the internet E. to contain logical information about the device to use for end-to-end transmission

1 Answers  

---

Which layer manages protocol access to the Network layer? A.) Datalink - MAC Sublayer B.) Datalink - LLC Sublayer C.) Transport D.) Session E.) Network

3 Answers  

---

PLACE YOURS QUESTION HERE I ALSWYS BE HERE FROM 9 AM TO 6PM SO U CAN FIND YOUR ANSWER QUICKLY.IF I KNOW THEN ? JJIITTEENNDDEERRAA SSIINNHHAA

4 Answers  

---

Which of the following provide correct information about a protocol at the transport layer of the OSI model? A.) UDP - Provides Connectionless datagrams service B.) TCP - Provides Connection Oriented Services C.) SMTP - Provides Mail Exchange D.) IP - Route determination E.) TCP - Provides Flow Control and Error Checking F.) FTP - Transfers of Files

2 Answers  

---

When would you use ISDN? A.) To connect LANs using POTS B.) To support applications requiring voice, data, and video C.) When you need a consistent and very high rate of data speed D.) To connect to IBM mainframes

1 Answers  

---

NetWare IPX addressing uses a network number and a node number. Which statements are true? A. The network address is administratively assigned and can be up to 16 hexadecimal digits long. B. The node address is always administratively assigned. C. The node address is usually the MAC address. D. If the MAC address is used as the node address, then IPX eliminates the use of ARP.

1 Answers  

---

Identify the administrative distance and appropriate routing protocol? A.) RIP = 255, IGRP = 100 B.) RIP = 100, IGRP = 120 C.) RIP = 1, IGRP = 0 D.) RIP = 120, IGRP = 100

4 Answers  

---

Why OSI layers having 7 layers instead of one layer.

8 Answers   HCL,

---