Zero for a host address
Have an issue, hope many of you don't feel this is too off topic. Many of = you have helped me in the past with certification questions, perhaps you = can assist with this one as well. I am trying to establish a connection to the City of Greenville's network. = What should be a simple connection is giving me fits. I'm currently using 2 Cisco 1601 routers, routing RIPv2. From my network = to the city's, I pass through a total of 5 routers (2 our mine, 3 belong = to the city). Currently I can communicate with each router and vice versa = via Telnet or ping. However, the city of Greenville's network has the = following IP address 10.128.0.0/12 (or 255.240.0.0). The interface = attached to the city of Greenville's network is 10.130.0.1/12. Everything = within this network has 3'd octet of zero. =20 Originally, from his network he could not ping us, however I could ping = him (him being the net admin using a PC with an address of 10.130.0.24/12).= I added a default route on one of my Cisco's pointing back to his = network and that problem went away. Now I'm trying to add an ACL on our = router blocking all but Telnet traffic coming from a host on his network = to a host within our network. In testing I can get the ACL's to work for = every system except one on the 10.128.0.0 subnet. By work I mean on the = networks in between my network and the city's I can setup ICMP or Telnet = ACL's permitting traffic and they can get in. This was done for testing = purposes only. My goal is to lock everyone out but the host w/ an IP = address of 10.130.0.24/12. I believe that the problem lies with the zero being used as a third octet = . However I've seen Cisco documentation using zero's as host addresses. = I'm a bit confused for I've found plenty of documentation stating that = zero's in the network/subnet address aren't recommended, however I can = find nothing stating zero's in the "host" portion aren't recommended. Any ideas? Has anyone come across a problem like this before? Simple answer would be to tell the city of Greenville to remove the zero = in the third octet and replace it with a one or higher. The answer from = them is that it would be too much trouble. This is their default gateway = for over 450 machines. So I'm looking for help to see if there's anything = else I can try. Thanks for any and all advice, rtw !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" HTMLHEAD META http-equiv=Content-Type content="text/html; charset=iso-8859-1" META content="MSHTML 5.50.4134.600" name=GENERATOR/HEAD BODY style="MARGIN-TOP: 2px; FONT: 8pt MS Sans Serif; MARGIN-LEFT: 2px" DIVFONT size=1Have an issue, hope many of you don't feel this is too off topic.nbsp; Many of you have helped me in the past with certification questions, perhaps you can assist with this one as well./FONT/DIV DIVFONT size=1/FONTnbsp;/DIV DIVFONT size=1I am trying to establish a connection to the City of Greenville's network.nbsp; What should be a simple connection is giving me fits./FONT/DIV DIVFONT size=1/FONTnbsp;/DIV DIVFONT size=1I'm currently using 2 Cisco 1601 routers, routing RIPv2.nbsp; From my network to the city's, I pass through a total of 5 routers (2 our mine, 3 belong to the city).nbsp; Currently I can communicate with each router and vice versa via Telnet or ping.nbsp; However, thenbsp;city of Greenville'snbsp;network has the following IP address 10.128.0.0/12 (or 255.240.0.0).nbsp; The interface attached to the city of Greenville's network is 10.130.0.1/12.nbsp; Everything within this network hasnbsp; 3'd octet of zero.nbsp; /FONT/DIV DIVFONT size=1/FONTnbsp;/DIV DIVFONT size=1Originally, fromnbsp;his network he could not ping us, however I could ping him (him beingnbsp;the net admin using anbsp;PC with an address of 10.130.0.24/12).nbsp; I added a default route on one of my Cisco's pointing back to his network and that problem went away.nbsp; Now I'm trying to add an ACL on our router blocking all but Telnet traffic coming from a host on his network to a host within our network.nbsp; In testing I can get the ACL's to work for every system except one on the 10.128.0.0 subnet.nbsp; By work I mean on the networks in between my network and the city's I can setup ICMP or Telnet ACL's permitting traffic and they can get in.nbsp; This was done for testing purposes only.nbsp; My goal is to lock everyone out but the host w/ an IP address of 10.130.0.24/12./FONT/DIV DIVFONT size=1/FONTnbsp;/DIV DIVFONT size=1I believe that the problem lies with the zero being used as anbsp;third octetnbsp;.nbsp; However I've seen Cisco documentation using zero's as host addresses.nbsp; I'm a bit confused for I've found plenty of documentation stating that zero's in the network/subnet address aren't recommended, however I can find nothing stating zero's in the "host" portion aren't recommended./FONT/DIV DIVFONT size=1/FONTnbsp;/DIV DIVFONT size=1Any ideas?nbsp; Has anyone come across a problem
CCDA question-512 bit times
I have a question regarding the round-trip propagation delay on an Ethernet network. Page 123 of the Cisco Press "Designing Cisco Networks" book states: "The most significant design rule for Ethernet is that the round-trip propagation delay in one collision domain must not exceed 512 bit times, which is a requirement for collision detection to work correctly." With 100Mbps Ethernet, the maximum round-trip delay would be 5.12 seconds, resulting in a distance limitation of 205 meters. I currently oversee a large flat network covering several miles in diameter. All of the links between buildings are single-mode fiber links. No routing is involved, everything is switched - one large broadcast domain. How does the 512 bit time rule apply to fiber optic cabling? I see on page 127 of the same book that the Round trip delay in bit times per meter for Cat5 cable is 1.112, whereas Fiber-optic cable it's 1.0. I guess I'm having difficulty understanding how fiber can overcome the 512 bit-time rule and can have a much longer distance. I do realize that this is not exactly a Cisco question, though covered on the DCN/CCDA material. If someone could kindly refer me to any material that covers this topic, I'd appreciate it. ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ACRC
790 is the passing score for all. "Amit Lilani" [EMAIL PROTECTED] 07/24/00 03:12AM just wanted to know the passing marks for ccna ... i just gave it today got 727 out of 1000 --- 790 was passing ... all places told me 70 percent was passing ... of all my acrc book also told 70 is passing... does it change from person to person.. or is it 790 ... or was it a mistake done for me... thanks... ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Catalyst 1900 - upgrade to Enterprise Edition
I'd like to add a couple Cisco Catalyst 1900 switches to my home lab. A couple auction sites list good prices for the Catalyst 1900 model WS-C1912C-A. However, it is not the enterprise edition. I see that the enterprise edition upgrade kit (WS-C19/28EEUG) for the Catalyst 1900 is listed on Cisco's web site. What exactly is involved to go to the enterprise edition? Is simply a software upgrade, or is the purchase of hardware necessary? Would it be recommended to purchase a switch w/ the enterprise edition on it already and pay 200-300 more instead of dealing with the upgrade kit? On a similar topic what's Cisco's policy on the following situation: If I buy a router from an auction site, for my home lab ONLY, and it has the IP feature set, but I'd like the enterprise feature set, can I just download it from Cisco, or do I need a paper license stating that I've paid x dollars for this feature set? I hope it's not felt that this topic was off topic. I know there are many individuals out there who are setting up home labs and this may pertain to them. Thanks in advance for your assistance. rtw ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Catalyst 1900 - upgrade to Enterprise Edition
I'd like to add a couple Cisco Catalyst 1900 switches to my home lab. A couple auction sites list good prices for the Catalyst 1900 model WS-C1912C-A. However, it is not the enterprise edition. I see that the enterprise edition upgrade kit (WS-C19/28EEUG) for the Catalyst 1900 is listed on Cisco's web site. What exactly is involved to go to the enterprise edition? Is simply a software upgrade, or is the purchase of hardware necessary? Would it be recommended to purchase a switch w/ the enterprise edition on it already and pay 200-300 more instead of dealing with the upgrade kit? On a similar topic what's Cisco's policy on the following situation: If I buy a router from an auction site, for my home lab ONLY, and it has the IP feature set, but I'd like the enterprise feature set, can I just download it from Cisco, or do I need a paper license stating that I've paid x dollars for this feature set? I hope it's not felt that this topic was off topic. I know there are many individuals out there who are setting up home labs and this may pertain to them. Thanks in advance for your assistance. rtw ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
